emrg: bump version to v0.2.52 (release: #857 #858 #859 #860 #861)

[argszero]

v0.2.52 Release Bump (host release instruction 2026-08-19T10:11:42)

Bump version 0.2.51 → 0.2.52 across the 8 standard files (9 refs), identical to the v0.2.51 bump (#856):

• emrg/__init__.py
• pyproject.toml
• uv.lock
• emrg/gui/package.json
• emrg/gui/package-lock.json
• packaging/build-runtime.sh
• packaging/make-installer.sh
• packaging/make-run-installer.sh

Release content (already on master, 5 commits since v0.2.51)

1. emrg: installer old-python health check before stop_all (rant 2026-08-19T00:44:52) #857 — Installer resilience: old-python health check before stop_all (fixes Windows upgrade encodings crash)
2. emrg: scheduler workspace-heal async offload + clone backoff (rant 2026-08-19T00:54:32) #858 — Scheduler workspace-heal async offload + clone-failure exponential backoff (fixes Windows 60s disconnect/reconnect loop)
3. emrg: offload remaining sync git probes from event loop (rant 2026-08-19T01:05:47) #859 — Remaining sync git probes off the event loop (zero-blocking systemic fix)
4. emrg: fix vibe-check done-frame content loss + evidence-driven prompt template #860 — vibe-check done-frame content-loss fix + evidence-driven prompt template emrg/server/prompts/vibe_check.j2 (GUI task records show natural-language summary instead of machine fallback)
5. emrg: daemon single-instance via fixed-port bind exclusivity (rant 2026-08-19T08:05:21) #861 — Daemon single-instance via fixed-port bind exclusivity (dual-instance root fix)

Verification

• emrg.__version__ → 0.2.52 ✓
• package.json / package-lock.json parse as valid JSON ✓
• python -m emrg --help works ✓
• Local test-runner ban applies (host-enforced); full test suite runs on CI runners normally

After merge: tag v0.2.52 → push → Build Release workflow → GitHub Release.

[argszero]

✅ LGTM — cycle 858: v0.2.52 bump verified (8 files / 9 refs, identical to the v0.2.51 bump #856), emrg.version=0.2.52, JSON valid, CLI OK. CI test+test-windows both PASS (run 32207889457, incl. version-sync + doc-count guards).

[argszero]

✅ LGTM — cycle 859 (2/3): re-verified head diff — 8 files / 9 refs all 0.2.51→0.2.52 consistent, CI test+test-windows both PASS (run 32207889457). Release bump for #857-#861.

[argszero]

✅ LGTM — cycle 860 (3/3): head unchanged 2255c54, CI test+test-windows PASS (32207889457), MERGEABLE+CLEAN. Three consecutive LGTMs from cycles 858/859/860 — merging for the v0.2.52 release.