Add per-stream sequence-gap detection#313
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Nothing tracked per-stream monotonic sequence numbers to detect missing, out-of-order, or duplicate messages. Add SequenceTracker.observe which classifies each sequence number as ok / duplicate / gap (recording the missing numbers) / reorder (late arrivals fill gaps), plus gaps and high_water per stream. Complements dedup_window. Wired through facade, executor (AC_sequence_observe, 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 | 26 |
| Duplication | 0 |
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What
Nothing tracked per-stream monotonic sequence numbers to detect missing, out-of-order, or duplicate messages.
SequenceTracker.observe(stream_id, seq)→{status: ok|duplicate|gap|reorder, seq, missing}.gaps(stream_id)/high_water(stream_id); streams tracked independently.Complements
dedup_window(seen-before) with ordering/gap classification.Layers
utils/sequence_gap/(pure stdlib, zero PySide6).SequenceTracker+__all__.AC_sequence_observe(named-instance registry).ac_sequence_observe.test/unit_test/headless/test_sequence_gap_batch.py(7 tests).v105_features_doc.rst(EN + Zh) + toctrees + 3 README What's-new sections.Verification
pytest→ 7 passed;ruff/pylint 10.00/bandit/radon clean; Qt-free.