Remove the OpenHuman framing from core (#18 §C4)

[YellowSnnowmann]

Issue #18§C4 — default_openhuman_dir() and the OpenHuman framing come out of tinymemory-core.

Deletes default_openhuman_dir() and its only caller, MemoryClient::new_local().

Why now

new_local is the constructor behind openhuman#5570: it pinned ~/.openhuman/workspace from the home directory, ignoring host workspace scoping — on a scoped host the profile write landed in a store nothing else reads. It failed by succeeding. openhuman#5575 (merged) removed the last caller, and its review noted the host side cannot lint against a dead upstream function — a BYPASS_PATTERNS needle for it fails bypass_patterns_are_all_live. The hazard closes here or not at all. This also completes follow-up #3 from that review.

With both gone, core no longer knows the host's directory layout: every construction path takes an explicit workspace directory.

Deliberately kept

Item	Why
global::init_default()	#[cfg(test)]; doc already forbids production use
"openhuman" embedder slug	host config vocabulary, not directory framing — removal breaks configs for no containment gain
OPENHUMAN_OLLAMA_BASE_URL	#[cfg(test)] only (TestEmbeddingHost)
test fixture prose	not framing
dirs dependency	engine/persona.rs still resolves home for persona files

Validation

Command	Result
cargo test -p tinymemory-core	804 passed, 0 failed
cargo clippy -p tinymemory-core --all-targets	clean
cargo fmt --all -- --check	clean
grep -rn 'new_local|default_openhuman_dir' (both trees)	zero survivors

Independent of #46 (§B4) — disjoint files.

[coderabbitai]

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[tinysweeper]

tinysweeper found nothing blocking. Approving.

$0.0000 · 0 in / 0 out · 111 embedded · openrouter/openai/text-embedding-3-small

[tinysweeper]

How this change flows

1 changed behaviour across 11 relationships. 6 surrounding behaviours are shown (60 graph nodes walked). 34 further behaviours left out to keep the diagram readable.

flowchart LR
n0["MemoryClient<br/>changed"]:::changed
n1["make_client"]:::impacted
n2["memory_client"]:::impacted
n3["from_workspace_dir"]:::impacted
n4["...r_skill_memory_targets_prefixed_namespace"]:::impacted
n5["...ot_error_for_namespaced_and_global_writes"]:::impacted
n6["MemoryClientRef"]:::impacted
n1 -->|uses| n0
n1 -->|calls| n3
n2 -->|uses| n0
n2 -->|calls| n3
n2 -->|tests| n3
n2 -->|uses| n6
n4 -->|calls| n1
n4 -->|tests| n1
n5 -->|calls| n1
n5 -->|tests| n1
n6 -->|uses| n0
classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff

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_{Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge.}