[Bridge surgery] flock + bridge package + readiness doc

[JosephOIbrahim]

Five MoE roles converged on bridge-readiness work directed by Joseph:

• Substrate Engineer: stdlib fcntl cross-process lockfile in
  Moneta.init (POSIX-only, opt-in via snapshot_path; lockfile
  at snapshot_path.with_suffix('.lock')). Released in close()
  before _ACTIVE_URIS discard. Hardens the in-process registry
  against multi-process corruption flagged in the audit.

• USD Engineer: codeless CozyRoom + CozyMemory schema at
  bridge/schema/ for Comfy-Cozy session emissions. UUID-based
  prim paths (substrate convention [Bridge surgery] flock + bridge package + readiness doc #1). embeddingHint contract
  documented (empty = bridge embeds; non-empty length must match
  embedder dim).

• Bridge Engineer: bridge/ package skeleton with Embedder
  Protocol + SentenceTransformersEmbedder default
  (all-MiniLM-L6-v2, 384-dim, normalize_embeddings=True). Lazy
  sentence-transformers import so the module is importable
  without the dep.

• Documentarian: promoted bridge readiness assessment from
  /root/.claude/plans/ into docs/bridge-readiness.md. Flagged
  CLAUDE.md drift (says v1.0.0; pyproject says v1.2.0rc1) for a
  follow-up pass.

• Test Engineer: 5 adversarial flock tests (in-process collision,
  cross-process block, release-on-close, ephemeral no-flock,
  lockfile-path), all POSIX-skipped on win32. 6 embedder tests
  (one verifies lazy-import without sentence-transformers; five
  use importorskip for the live model).

Verification: 75 unit + 22 integration green (97 total, 4 skipped
on pxr unavailability — unchanged). smoke_check passes. Ruff
delta on api.py: 17 -> 18 errors (one Optional[Any] matching
codebase convention; B904 fix pre-empted a +2 delta).

Net new: bridge/ package, docs/bridge-readiness.md,
tests/unit/test_api_flock.py, +63 lines src/moneta/api.py.

https://claude.ai/code/session_01WhWjg9f9D6X76tDiZCvj1p

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e42702e1-ee60-47b0-8d16-ada1eec7f306

📥 Commits

Reviewing files that changed from the base of the PR and between 9a46293 and 24dc152.

📒 Files selected for processing (12)

• .gitignore
• bridge/README.md
• bridge/moneta_bridge/__init__.py
• bridge/moneta_bridge/embedder.py
• bridge/pyproject.toml
• bridge/schema/CozySchema.usda
• bridge/schema/plugInfo.json
• bridge/tests/__init__.py
• bridge/tests/test_embedder.py
• docs/bridge-readiness.md
• src/moneta/api.py
• tests/unit/test_api_flock.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/audit-moneta-api-nvUfG

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