feat(ticket-018): accelerate panic log scanning and diagnostics with native Rust worker

[tom-sapletta-com]

Summary

• Extend src/uncrash/snapshot.rs with native --scan-panics <dir> [budget] CLI mode.
• Integrate native panic scanning into src/uncrash/diagnostics.py with fast discovery and seamless Python fallback.
• Add find_native_worker in src/uncrash/store.py to locate precompiled workers without rustc compiler latency.
• Add test coverage in tests/test_diagnostics.py validating exact parity between native and Python scanners, edge-case rejection, and fallback.
• Pass governance checks and complete product test suite (248 passed, 9 skipped).

[ifuri-validator-agent]

Validator approval after policy checks for exact head 128493c510130433e2ff9b8722bfb94e169ecd8c.

Ticket: ticket-018
Correlation ID: local-semcod-uncrash-pr-17-ticket-018
Model: openai/cursor-auto
Reviewed diff chunks: 2
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 2 diff chunk(s). Chunk 1 adds native --scan-panics scanning in Rust with symlink/NOFOLLOW guards and JSON escaping, plus a Python wrapper that prefers the native worker and falls back safely. Required protected checks all PASS. Visible integration looks coherent for this chunk; minor behavioral and typing notes only. | Chunk 2 adds native --scan-panics wiring, find_native_worker discovery with ownership/mode/no-link hardening, and parity/fallback/discovery tests. Required checks all PASS (governance enforce, remote lifecycle, onedev/local-verify). Visible changes look consistent and defensive; no unresolved code or security defects in this chunk.
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: b7865c50d0c18c86b6f1488bb9062a626525b57d...128493c510130433e2ff9b8722bfb94e169ecd8c
Change digest: 3277f98b45d91a00ede123cb08e4fb73f553196a8ff11204a67e6edb69d2d325
Score: 48/100 (M), estimated 55 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-018-1392
TICKET ticket-018
HEAD_SHA 128493c510130433e2ff9b8722bfb94e169ecd8c
CORRELATION_ID local-semcod-uncrash-pr-17-ticket-018
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
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VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "APPROVE" MODEL "openai/cursor-auto"
ASSERT VERDICT_AUTHORITY != "ADVISORY"