Add idempotency-key store with stored responses#311
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RetryPolicy re-executes on retry and work_queue dedups only in-flight references — nothing cached the first result so a duplicate returned the same response without re-running the side effect. Add a Stripe-style IdempotencyStore (begin → new/in_progress/completed, complete, replay, fingerprint-conflict detection, injectable-clock TTL, JSON persistence) and request_fingerprint. Wired through facade, executor (AC_idempotency_ begin / AC_idempotency_complete, 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 | 37 |
| Duplication | 0 |
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What
RetryPolicyre-executes on retry andwork_queuededups only in-flight refs — nothing cached the first result so a duplicate request returns the same response without re-running the side effect.IdempotencyStore.begin(key, request_fingerprint?)→{status: new|in_progress|completed, response};complete(key, response);get; injectable-clockttl;save/load.IdempotencyConflict.request_fingerprint(payload)— stable order-independent SHA-256.Layers
utils/idempotency/(pure stdlibhashlib/json, zero PySide6).__all__.AC_idempotency_begin,AC_idempotency_complete(named-instance registry).ac_idempotency_begin,ac_idempotency_complete.test/unit_test/headless/test_idempotency_batch.py(8 tests; TTL via injected clock).v103_features_doc.rst(EN + Zh) + toctrees + 3 README What's-new sections.Verification
pytest→ 8 passed;ruff/pylint 10.00/bandit/radon clean; Qt-free.