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Bug A from the 2026-05-09 smoke run. be-dev-1 called i_will_work_on without `plan` on a pending task; claim() ran first (transitioned to `claimed`), then the plan check failed → tracing_gap. The natural retry path then dispatched to `_i_will_work_on_claimed`, which had no plan-recovery logic and called start() against a still-plan-less task, returning `start failed` forever. The dev kept looping; the parent escalated up; the whole slice ended `blocked`. Two changes (Task-5 atomicity pattern applied to i_will_work_on): 1. `_i_will_work_on_pending`: move the plan precondition BEFORE `claim()`. A missing-plan first call now returns tracing_gap with the task untouched in `pending`, so the agent's retry-with-plan succeeds cleanly. 2. `_i_will_work_on_claimed`: now accepts `plan` and calls set_plan before start() if the task has no plan yet. Recovery path for any already-stuck task (e.g. left over from the earlier image, or an orchestrator restart that left a partial claim). Also wires `plan` through the dispatcher to the claimed branch. Tests: 3137 passing (3135 + 2 regression tests pinning the atomic invariant), 100% coverage, ruff clean.