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feat(FN-5220): guard explicit duplicate markers in triage and self-healing

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Adds an explicit duplicate-marker guard (FN-5220) spanning core helper, dashboard API endpoint, triage short-circuit, and self-healing sweep to detect and handle duplicate task creation attempts; includes comprehensive test coverage across unit, API, and integration layers plus documentation.

Fusion-Task-Id: FN-5220
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Fusion (runfusion.ai)
2026-05-20 13:46:34 -07:00
committed by gsxdsm
parent 9eea9f48f0
commit 8f2d5e7e61
12 changed files with 869 additions and 12 deletions
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"@runfusion/fusion": patch
---
Block explicit `DUPLICATE: FN-NNNN` redirect tasks from consuming planning
cycles. The triage planning loop now short-circuits when the generated
PROMPT.md is a one-line duplicate marker (bypassing the `fn_review_spec`
APPROVE gate), a self-healing sweep resolves already-stuck duplicate-marker
tasks in `triage`/`todo`, and the dashboard `POST /api/tasks` route
surfaces a `409 duplicate_candidates` with `reason: "explicit-marker"` when
the description is exactly a duplicate redirect. Layered on top of
FN-4829 / FN-4918 / FN-5152; fails open.