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91f9642f27
The Main PM claimed every MegaTask wave at once, ignoring the collision-ordered
dependencies. The sequencing data was correct (analyzer wired proper waves), but
enforcement was only half-wired: the unmet-dependency guard lives on the gateway
claim verbs (i_will_plan -> _run_claim_guards), while the orchestrator dispatches
coordination roots itself — _dispatch_pm_work fetches pending with no dependency
filter and _claim_task_for_agent system-claims via the raw POST /tasks/{id}/claim
route -> TaskService.claim, which had no dependency check. So the orchestrator
claimed every pending root-subtask for the Main PM regardless of wave.
Enforce the sequence at the claim chokepoint: _validate_claim_preconditions now
refuses to claim a PENDING task while any depends_on task is non-terminal
(extracted into _claim_blocked_by_dependencies for the complexity budget). This
guardrails every claim path — the gateway verbs (redundant) and the orchestrator
raw dispatch claim (the hole). Scoped to a PENDING start-of-work claim so a
mid-lifecycle QA/doc claim is unaffected; dependencies are monotonic so each wave
claims normally once the prior one completes.
Adds test_claim_pending_with_unmet_dependency_returns_none (blocked with an
unfinished dependency; claimable once it completes).
Co-authored-by: Renn F <rennf93@users.noreply.github.com>