[ticket-004] fix(planfile): dedupe WUP incident tickets by failure signature

[tom-sapletta-com]

Summary

• Dedupe WUP planfile incident tickets by the (service, stage, status) signature, not only the exact message fingerprint — volatile message details (latency values, timestamps) previously spawned sibling tickets for one incident (c2004 registry: 136 fingerprints, 43 for connect-scenario/probe-latency alone).
• After a signature ticket reaches a terminal status, re-filing is suppressed for planfile.refile_cooldown_seconds (default 24h) measured from the ticket's updated_at; the observed closed_at is cached per dedupe entry (terminal statuses are immutable).
• refile_cooldown_seconds=0 restores the previous immediate re-file behaviour; lookup errors remain conservative (unreadable tickets keep muting).

Test plan

• tests/test_planfile_reporter_dedupe.py — 12 tests, incl. open-sibling mute with different message, cooldown mute, cached closed_at, zero-cooldown refile
• Full suite: 373 passed

[ifuri-validator-agent]

Validator approval after policy checks for exact head 9c9b443a44c983e6c99cd2ff134fc10c42091f7a.

Ticket: ticket-004
Correlation ID: local-semcod-wup-pr-23-ticket-004
Model: openai/cursor-auto
Reviewed diff chunks: 2
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 2 diff chunk(s). Chunk 2 of 2: Introduces signature-based incident deduplication, a configurable cooldown period (refile_cooldown_seconds), and helper methods for parsing ticket statuses. Also includes extensive test coverage for the new behavior. | The diff chunk correctly implements the signature-based ticket deduplication logic and cooldown handling. The _signature_mute method properly checks existing entries for open tickets or recently closed tickets based on the cooldown period, and the _parse_instant method safely parses timestamps.
Advisory findings: none
The LLM output above is advisory and was not used as the approval trust root.
Semantic review prerequisite: not_required; policy 676cb4516bbfed2a000e40b9b1b6e4a430ecc761ec546aeb53d721a1905cfdd7.

Actual PR impact radar

Exact range: 8832bcb92b4eba10a9e8057ac70fbf8f65e66065...9c9b443a44c983e6c99cd2ff134fc10c42091f7a
Change digest: 9eecb4a890334247a36d7313c024700e4c7ae7a25e6ca9b21b3bc28dc20f0e90
Score: 52/100 (M), estimated 60 min, split recommended: true
Affected services/components: repository-wide/unclassified

Machine-readable radar JSONL and SVG

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Merge will be attempted after this approval when explicitly authorized. ## Decision record (recomputable)

DECISION D-004-2557
TICKET ticket-004
HEAD_SHA 9c9b443a44c983e6c99cd2ff134fc10c42091f7a
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VERDICT APPROVE AUTHORITY DETERMINISTIC
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