Add optimistic-concurrency versioned store (CAS / If-Match)#314
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http_conditional uses ETag for read caching (If-None-Match / 304) but never for write concurrency. Add a local compare-and-swap VersionedStore: put only when expected_version matches (VersionConflict on a stale write), monotonic version, guarded delete, JSON persistence, plus if_match_header / check_if_match to bridge to HTTP If-Match. Wired through facade, executor (AC_cas_put / AC_cas_get, named-instance registry), MCP, and the Script Builder with a headless test batch and EN/Zh docs.
Up to standards ✅🟢 Issues
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| Metric | Results |
|---|---|
| Complexity | 40 |
| Duplication | 1 |
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What
http_conditionaluses ETag for read caching but never for write concurrency. This is the local compare-and-swap store for "update only if the version is unchanged".VersionedStore.put(key, value, *, expected_version)→ new version (raisesVersionConflicton a stale write;0= create-only, omit = blind).get→{value, version}; guardeddelete;save/load.if_match_header(version)/check_if_match(current, header)bridge to HTTPIf-Match.Layers
utils/optimistic/(pure stdlibjson, zero PySide6).__all__.AC_cas_put,AC_cas_get(named-instance registry).ac_cas_put,ac_cas_get.test/unit_test/headless/test_optimistic_batch.py(9 tests).v106_features_doc.rst(EN + Zh) + toctrees + 3 README What's-new sections.Verification
pytest→ 9 passed;ruff/pylint 10.00/bandit/radon clean; Qt-free.