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argszero merged 1 commit into from
Aug 29, 2026
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emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) #1073

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14 changes: 14 additions & 0 deletions emrg/server/daemon.py
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
if old_bias <= 0:
return
shift = abs(new_bias - old_bias) / old_bias
# Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
# measurable — log EVERY computed shift unconditionally so the
# detector's heartbeat is visible in emrgd.log (grep
# "anchor-bias-heartbeat"), distinguishing "detector runs, providers
# stable" from "detector dead". The warning below stays reserved for
# actual drift.
logger.debug(
"anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
"old_bias=%.3f new_bias=%.3f — %s",
session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
old_bias, new_bias,
"within threshold, no drift"
if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
)
if shift < _SILENT_DRIFT_THRESHOLD:
return
try:
Expand Down
31 changes: 25 additions & 6 deletions tests/test_daemon.py
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
"""Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
under an unchanged base_url/model alias keeps the old provider's real
prompt_tokens as the projection base — the anchor "looks healthy while it
drifts". A fresh real_pt whose bias (real/est) deviates from the previous
anchored round beyond the threshold must emit a countable
anchor_provider_drift event and re-anchor on the new real number."""
anchor_provider_drift event and re-anchor on the new real number.

Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
log even when drift fires, proving the detector ran this round."""
stats = tmp_path / "usage-anchor.jsonl"
monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
server = _make_server()
sid = "silent-drift"
# Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
server._usage_anchors[sid] = (222_000, 148_000)
# Provider B round (same base_url): real 360K vs est 150K → bias 2.4
server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

lines = stats.read_text(encoding="utf-8").strip().splitlines()
assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
# Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
assert "bias_shift=0.6000" in caplog.text
assert "DRIFT — emitting event" in caplog.text
assert "usage anchor silent drift session=silent-drift" in caplog.text
# Re-anchor on the new provider's real number (natural anchor overwrite)
server._usage_anchors[sid] = (360_000, 150_000)
# Same provider bias again → no second event (stable after re-anchor)
server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
"""Issue #1027 — a small per-round bias wobble (same provider, estimate
noise) must NOT emit a drift event: the threshold separates real
tokenizer changes from normal variance."""
tokenizer changes from normal variance. Issue #1072 — the unconditional
heartbeat still proves the detector ran (no event, no warning)."""
stats = tmp_path / "usage-anchor.jsonl"
monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
server = _make_server()
sid = "no-drift"
server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
# Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
# Heartbeat present with "within threshold" verdict; no drift warning
assert "anchor-bias-heartbeat session=no-drift" in caplog.text
assert "bias_shift=0.0667" in caplog.text
assert "within threshold, no drift" in caplog.text
assert "usage anchor silent drift" not in caplog.text

# No anchor at all → no-op (first round, nothing to compare against)
caplog.clear()
server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
Expand Down
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) by how2how2how2-arch · Pull Request #1073 · argszero/emrg · GitHub
Skip to content
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)#1073

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 Merged

argszero
merged 1 commit into

from

Aug 29, 2026
 Merged


emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)
#1073
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14 changes: 14 additions & 0 deletions
emrg/server/daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
 if old_bias <= 0:
 return
 shift = abs(new_bias - old_bias) / old_bias
 # Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
 # measurable — log EVERY computed shift unconditionally so the
 # detector's heartbeat is visible in emrgd.log (grep
 # "anchor-bias-heartbeat"), distinguishing "detector runs, providers
 # stable" from "detector dead". The warning below stays reserved for
 # actual drift.
 logger.debug(
 "anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
 "old_bias=%.3f new_bias=%.3f — %s",
 session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
 old_bias, new_bias,
 "within threshold, no drift"
 if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
 )
 if shift < _SILENT_DRIFT_THRESHOLD:
 return
 try:
Expand Down

31 changes: 25 additions & 6 deletions
tests/test_daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
 """Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
 under an unchanged base_url/model alias keeps the old provider's real
 prompt_tokens as the projection base — the anchor "looks healthy while it
 drifts". A fresh real_pt whose bias (real/est) deviates from the previous
 anchored round beyond the threshold must emit a countable
 anchor_provider_drift event and re-anchor on the new real number."""
 anchor_provider_drift event and re-anchor on the new real number.

 Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
 bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
 log even when drift fires, proving the detector ran this round."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "silent-drift"
 # Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
 server._usage_anchors[sid] = (222_000, 148_000)
 # Provider B round (same base_url): real 360K vs est 150K → bias 2.4
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

 lines = stats.read_text(encoding="utf-8").strip().splitlines()
 assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
 assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
 assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
 assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
 # Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
 assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
 assert "bias_shift=0.6000" in caplog.text
 assert "DRIFT — emitting event" in caplog.text
 assert "usage anchor silent drift session=silent-drift" in caplog.text
 # Re-anchor on the new provider's real number (natural anchor overwrite)
 server._usage_anchors[sid] = (360_000, 150_000)
 # Same provider bias again → no second event (stable after re-anchor)
 server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
 """Issue #1027 — a small per-round bias wobble (same provider, estimate
 noise) must NOT emit a drift event: the threshold separates real
 tokenizer changes from normal variance."""
 tokenizer changes from normal variance. Issue #1072 — the unconditional
 heartbeat still proves the detector ran (no event, no warning)."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "no-drift"
 server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
 # Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 # Heartbeat present with "within threshold" verdict; no drift warning
 assert "anchor-bias-heartbeat session=no-drift" in caplog.text
 assert "bias_shift=0.0667" in caplog.text
 assert "within threshold, no drift" in caplog.text
 assert "usage anchor silent drift" not in caplog.text

 # No anchor at all → no-op (first round, nothing to compare against)
 caplog.clear()
 server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) by how2how2how2-arch · Pull Request #1073 · argszero/emrg · GitHub
Skip to content
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)#1073

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 Merged

argszero
merged 1 commit into

from

Aug 29, 2026
 Merged


emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)
#1073
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14 changes: 14 additions & 0 deletions
emrg/server/daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
 if old_bias <= 0:
 return
 shift = abs(new_bias - old_bias) / old_bias
 # Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
 # measurable — log EVERY computed shift unconditionally so the
 # detector's heartbeat is visible in emrgd.log (grep
 # "anchor-bias-heartbeat"), distinguishing "detector runs, providers
 # stable" from "detector dead". The warning below stays reserved for
 # actual drift.
 logger.debug(
 "anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
 "old_bias=%.3f new_bias=%.3f — %s",
 session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
 old_bias, new_bias,
 "within threshold, no drift"
 if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
 )
 if shift < _SILENT_DRIFT_THRESHOLD:
 return
 try:
Expand Down

31 changes: 25 additions & 6 deletions
tests/test_daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
 """Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
 under an unchanged base_url/model alias keeps the old provider's real
 prompt_tokens as the projection base — the anchor "looks healthy while it
 drifts". A fresh real_pt whose bias (real/est) deviates from the previous
 anchored round beyond the threshold must emit a countable
 anchor_provider_drift event and re-anchor on the new real number."""
 anchor_provider_drift event and re-anchor on the new real number.

 Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
 bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
 log even when drift fires, proving the detector ran this round."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "silent-drift"
 # Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
 server._usage_anchors[sid] = (222_000, 148_000)
 # Provider B round (same base_url): real 360K vs est 150K → bias 2.4
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

 lines = stats.read_text(encoding="utf-8").strip().splitlines()
 assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
 assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
 assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
 assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
 # Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
 assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
 assert "bias_shift=0.6000" in caplog.text
 assert "DRIFT — emitting event" in caplog.text
 assert "usage anchor silent drift session=silent-drift" in caplog.text
 # Re-anchor on the new provider's real number (natural anchor overwrite)
 server._usage_anchors[sid] = (360_000, 150_000)
 # Same provider bias again → no second event (stable after re-anchor)
 server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
 """Issue #1027 — a small per-round bias wobble (same provider, estimate
 noise) must NOT emit a drift event: the threshold separates real
 tokenizer changes from normal variance."""
 tokenizer changes from normal variance. Issue #1072 — the unconditional
 heartbeat still proves the detector ran (no event, no warning)."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "no-drift"
 server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
 # Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 # Heartbeat present with "within threshold" verdict; no drift warning
 assert "anchor-bias-heartbeat session=no-drift" in caplog.text
 assert "bias_shift=0.0667" in caplog.text
 assert "within threshold, no drift" in caplog.text
 assert "usage anchor silent drift" not in caplog.text

 # No anchor at all → no-op (first round, nothing to compare against)
 caplog.clear()
 server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
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var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) by how2how2how2-arch · Pull Request #1073 · argszero/emrg · GitHub
Skip to content
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)#1073

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 Merged

argszero
merged 1 commit into

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Aug 29, 2026
 Merged


emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)
#1073
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14 changes: 14 additions & 0 deletions
emrg/server/daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
 if old_bias <= 0:
 return
 shift = abs(new_bias - old_bias) / old_bias
 # Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
 # measurable — log EVERY computed shift unconditionally so the
 # detector's heartbeat is visible in emrgd.log (grep
 # "anchor-bias-heartbeat"), distinguishing "detector runs, providers
 # stable" from "detector dead". The warning below stays reserved for
 # actual drift.
 logger.debug(
 "anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
 "old_bias=%.3f new_bias=%.3f — %s",
 session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
 old_bias, new_bias,
 "within threshold, no drift"
 if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
 )
 if shift < _SILENT_DRIFT_THRESHOLD:
 return
 try:
Expand Down

31 changes: 25 additions & 6 deletions
tests/test_daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
 """Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
 under an unchanged base_url/model alias keeps the old provider's real
 prompt_tokens as the projection base — the anchor "looks healthy while it
 drifts". A fresh real_pt whose bias (real/est) deviates from the previous
 anchored round beyond the threshold must emit a countable
 anchor_provider_drift event and re-anchor on the new real number."""
 anchor_provider_drift event and re-anchor on the new real number.

 Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
 bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
 log even when drift fires, proving the detector ran this round."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "silent-drift"
 # Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
 server._usage_anchors[sid] = (222_000, 148_000)
 # Provider B round (same base_url): real 360K vs est 150K → bias 2.4
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

 lines = stats.read_text(encoding="utf-8").strip().splitlines()
 assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
 assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
 assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
 assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
 # Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
 assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
 assert "bias_shift=0.6000" in caplog.text
 assert "DRIFT — emitting event" in caplog.text
 assert "usage anchor silent drift session=silent-drift" in caplog.text
 # Re-anchor on the new provider's real number (natural anchor overwrite)
 server._usage_anchors[sid] = (360_000, 150_000)
 # Same provider bias again → no second event (stable after re-anchor)
 server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
 """Issue #1027 — a small per-round bias wobble (same provider, estimate
 noise) must NOT emit a drift event: the threshold separates real
 tokenizer changes from normal variance."""
 tokenizer changes from normal variance. Issue #1072 — the unconditional
 heartbeat still proves the detector ran (no event, no warning)."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "no-drift"
 server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
 # Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 # Heartbeat present with "within threshold" verdict; no drift warning
 assert "anchor-bias-heartbeat session=no-drift" in caplog.text
 assert "bias_shift=0.0667" in caplog.text
 assert "within threshold, no drift" in caplog.text
 assert "usage anchor silent drift" not in caplog.text

 # No anchor at all → no-op (first round, nothing to compare against)
 caplog.clear()
 server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) by how2how2how2-arch · Pull Request #1073 · argszero/emrg · GitHub
Skip to content
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)#1073

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 Merged

argszero
merged 1 commit into

from

Aug 29, 2026
 Merged


emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)
#1073
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14 changes: 14 additions & 0 deletions
emrg/server/daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
 if old_bias <= 0:
 return
 shift = abs(new_bias - old_bias) / old_bias
 # Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
 # measurable — log EVERY computed shift unconditionally so the
 # detector's heartbeat is visible in emrgd.log (grep
 # "anchor-bias-heartbeat"), distinguishing "detector runs, providers
 # stable" from "detector dead". The warning below stays reserved for
 # actual drift.
 logger.debug(
 "anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
 "old_bias=%.3f new_bias=%.3f — %s",
 session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
 old_bias, new_bias,
 "within threshold, no drift"
 if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
 )
 if shift < _SILENT_DRIFT_THRESHOLD:
 return
 try:
Expand Down

31 changes: 25 additions & 6 deletions
tests/test_daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
 """Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
 under an unchanged base_url/model alias keeps the old provider's real
 prompt_tokens as the projection base — the anchor "looks healthy while it
 drifts". A fresh real_pt whose bias (real/est) deviates from the previous
 anchored round beyond the threshold must emit a countable
 anchor_provider_drift event and re-anchor on the new real number."""
 anchor_provider_drift event and re-anchor on the new real number.

 Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
 bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
 log even when drift fires, proving the detector ran this round."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "silent-drift"
 # Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
 server._usage_anchors[sid] = (222_000, 148_000)
 # Provider B round (same base_url): real 360K vs est 150K → bias 2.4
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

 lines = stats.read_text(encoding="utf-8").strip().splitlines()
 assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
 assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
 assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
 assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
 # Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
 assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
 assert "bias_shift=0.6000" in caplog.text
 assert "DRIFT — emitting event" in caplog.text
 assert "usage anchor silent drift session=silent-drift" in caplog.text
 # Re-anchor on the new provider's real number (natural anchor overwrite)
 server._usage_anchors[sid] = (360_000, 150_000)
 # Same provider bias again → no second event (stable after re-anchor)
 server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
 """Issue #1027 — a small per-round bias wobble (same provider, estimate
 noise) must NOT emit a drift event: the threshold separates real
 tokenizer changes from normal variance."""
 tokenizer changes from normal variance. Issue #1072 — the unconditional
 heartbeat still proves the detector ran (no event, no warning)."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "no-drift"
 server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
 # Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 # Heartbeat present with "within threshold" verdict; no drift warning
 assert "anchor-bias-heartbeat session=no-drift" in caplog.text
 assert "bias_shift=0.0667" in caplog.text
 assert "within threshold, no drift" in caplog.text
 assert "usage anchor silent drift" not in caplog.text

 # No anchor at all → no-op (first round, nothing to compare against)
 caplog.clear()
 server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) by how2how2how2-arch · Pull Request #1073 · argszero/emrg · GitHub
Skip to content
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)#1073

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 Merged

argszero
merged 1 commit into

from

Aug 29, 2026
 Merged


emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)
#1073
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14 changes: 14 additions & 0 deletions
emrg/server/daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
 if old_bias <= 0:
 return
 shift = abs(new_bias - old_bias) / old_bias
 # Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
 # measurable — log EVERY computed shift unconditionally so the
 # detector's heartbeat is visible in emrgd.log (grep
 # "anchor-bias-heartbeat"), distinguishing "detector runs, providers
 # stable" from "detector dead". The warning below stays reserved for
 # actual drift.
 logger.debug(
 "anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
 "old_bias=%.3f new_bias=%.3f — %s",
 session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
 old_bias, new_bias,
 "within threshold, no drift"
 if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
 )
 if shift < _SILENT_DRIFT_THRESHOLD:
 return
 try:
Expand Down

31 changes: 25 additions & 6 deletions
tests/test_daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
 """Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
 under an unchanged base_url/model alias keeps the old provider's real
 prompt_tokens as the projection base — the anchor "looks healthy while it
 drifts". A fresh real_pt whose bias (real/est) deviates from the previous
 anchored round beyond the threshold must emit a countable
 anchor_provider_drift event and re-anchor on the new real number."""
 anchor_provider_drift event and re-anchor on the new real number.

 Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
 bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
 log even when drift fires, proving the detector ran this round."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "silent-drift"
 # Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
 server._usage_anchors[sid] = (222_000, 148_000)
 # Provider B round (same base_url): real 360K vs est 150K → bias 2.4
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

 lines = stats.read_text(encoding="utf-8").strip().splitlines()
 assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
 assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
 assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
 assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
 # Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
 assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
 assert "bias_shift=0.6000" in caplog.text
 assert "DRIFT — emitting event" in caplog.text
 assert "usage anchor silent drift session=silent-drift" in caplog.text
 # Re-anchor on the new provider's real number (natural anchor overwrite)
 server._usage_anchors[sid] = (360_000, 150_000)
 # Same provider bias again → no second event (stable after re-anchor)
 server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
 """Issue #1027 — a small per-round bias wobble (same provider, estimate
 noise) must NOT emit a drift event: the threshold separates real
 tokenizer changes from normal variance."""
 tokenizer changes from normal variance. Issue #1072 — the unconditional
 heartbeat still proves the detector ran (no event, no warning)."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "no-drift"
 server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
 # Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 # Heartbeat present with "within threshold" verdict; no drift warning
 assert "anchor-bias-heartbeat session=no-drift" in caplog.text
 assert "bias_shift=0.0667" in caplog.text
 assert "within threshold, no drift" in caplog.text
 assert "usage anchor silent drift" not in caplog.text

 # No anchor at all → no-op (first round, nothing to compare against)
 caplog.clear()
 server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
})();
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072) by how2how2how2-arch · Pull Request #1073 · argszero/emrg · GitHub
Skip to content
emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)#1073

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 Merged

argszero
merged 1 commit into

from

Aug 29, 2026
 Merged


emrg: usage anchor — unconditional bias-shift heartbeat + planted-fire assertions (issue #1072)
#1073
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14 changes: 14 additions & 0 deletions
emrg/server/daemon.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -3119,6 +3119,20 @@ def _detect_silent_anchor_drift(self, session, real_pt: int, estimate: int) -> N
 if old_bias <= 0:
 return
 shift = abs(new_bias - old_bias) / old_bias
 # Issue #1072 (heinrichneb, Dev.to 3dlo4): make "never fired"
 # measurable — log EVERY computed shift unconditionally so the
 # detector's heartbeat is visible in emrgd.log (grep
 # "anchor-bias-heartbeat"), distinguishing "detector runs, providers
 # stable" from "detector dead". The warning below stays reserved for
 # actual drift.
 logger.debug(
 "anchor-bias-heartbeat session=%s bias_shift=%.4f threshold=%.2f "
 "old_bias=%.3f new_bias=%.3f — %s",
 session.session_id, shift, _SILENT_DRIFT_THRESHOLD,
 old_bias, new_bias,
 "within threshold, no drift"
 if shift < _SILENT_DRIFT_THRESHOLD else "DRIFT — emitting event",
 )
 if shift < _SILENT_DRIFT_THRESHOLD:
 return
 try:
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31 changes: 25 additions & 6 deletions
tests/test_daemon.py

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Original file line numberDiff line numberDiff line change
Expand Up@@ -775,21 +775,26 @@ def test_usage_anchor_drift_measured_on_reanchor(tmp_path, monkeypatch):
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 2


def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
def test_silent_provider_drift_emits_event(tmp_path, monkeypatch, caplog):
 """Issue #1027 — heinrichneb (Dev.to 3dicj): a provider silently changing
 under an unchanged base_url/model alias keeps the old provider's real
 prompt_tokens as the projection base — the anchor "looks healthy while it
 drifts". A fresh real_pt whose bias (real/est) deviates from the previous
 anchored round beyond the threshold must emit a countable
 anchor_provider_drift event and re-anchor on the new real number."""
 anchor_provider_drift event and re-anchor on the new real number.

 Issue #1072 (Dev.to 3dlo4) — planted-fire measurable: the unconditional
 bias-shift heartbeat (grep "anchor-bias-heartbeat") must appear in the
 log even when drift fires, proving the detector ran this round."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "silent-drift"
 # Provider A round: real 222K vs est 148K → bias 1.5 (the #946 shape)
 server._usage_anchors[sid] = (222_000, 148_000)
 # Provider B round (same base_url): real 360K vs est 150K → bias 2.4
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 360_000, 150_000)

 lines = stats.read_text(encoding="utf-8").strip().splitlines()
 assert len(lines) == 1
Expand All@@ -800,29 +805,43 @@ def test_silent_provider_drift_emits_event(tmp_path, monkeypatch):
 assert ev["prev_est"] == 148_000 and ev["estimate"] == 150_000
 assert ev["bias_shift"] == pytest.approx(0.6, abs=0.01) # (2.4-1.5)/1.5
 assert ev["model"] == "gpt-4o-mini" and ev["provider"] == "localhost"
 # Heartbeat (issue #1072): unconditional shift log present + DRIFT flag
 assert "anchor-bias-heartbeat session=silent-drift" in caplog.text
 assert "bias_shift=0.6000" in caplog.text
 assert "DRIFT — emitting event" in caplog.text
 assert "usage anchor silent drift session=silent-drift" in caplog.text
 # Re-anchor on the new provider's real number (natural anchor overwrite)
 server._usage_anchors[sid] = (360_000, 150_000)
 # Same provider bias again → no second event (stable after re-anchor)
 server._detect_silent_anchor_drift(_SidSession(sid), 365_000, 152_000)
 assert len(stats.read_text(encoding="utf-8").strip().splitlines()) == 1


def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch):
def test_silent_drift_below_threshold_silent(tmp_path, monkeypatch, caplog):
 """Issue #1027 — a small per-round bias wobble (same provider, estimate
 noise) must NOT emit a drift event: the threshold separates real
 tokenizer changes from normal variance."""
 tokenizer changes from normal variance. Issue #1072 — the unconditional
 heartbeat still proves the detector ran (no event, no warning)."""
 stats = tmp_path / "usage-anchor.jsonl"
 monkeypatch.setattr(daemon_mod, "_USAGE_ANCHOR_STATS_PATH", stats)
 server = _make_server()
 sid = "no-drift"
 server._usage_anchors[sid] = (222_000, 148_000) # bias 1.5
 # Same provider: real 240K vs est 150K → bias 1.6 → shift 6.7% < 25%
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 with caplog.at_level("DEBUG", logger="emrg.server.daemon"):
 server._detect_silent_anchor_drift(_SidSession(sid), 240_000, 150_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 # Heartbeat present with "within threshold" verdict; no drift warning
 assert "anchor-bias-heartbeat session=no-drift" in caplog.text
 assert "bias_shift=0.0667" in caplog.text
 assert "within threshold, no drift" in caplog.text
 assert "usage anchor silent drift" not in caplog.text

 # No anchor at all → no-op (first round, nothing to compare against)
 caplog.clear()
 server._detect_silent_anchor_drift(_SidSession("fresh"), 10_000, 9_000)
 assert not stats.exists() or stats.read_text(encoding="utf-8").strip() == ""
 assert "anchor-bias-heartbeat" not in caplog.text # no old anchor → skip


def test_usage_anchor_cross_provider_window_attributable(tmp_path, monkeypatch):
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