docs: add task DAG for phase 9 remediation plan#107
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Captures the dependency structure of the 2026-03-10 phase 9 health review remediation plan: prerequisites, intra-stage ordering (1.11 after all other Stage 1, 2A.2 after 2A.1, 2B.1 after 1.11, 2C wiring after 2B refactors, 3.x after the OpenAPI gate and 3.0 reference, 6C after Stage 3), the topological layers a coordinator can fan out, and the critical path.
Removes superseded Stage 3 tasks 3.0-3.12 and replaces them with a single external-plan node pointing at the 2026-03-15 stage 3 convergence plan. Removes the fabricated 2C.1->2C.2 edge so the two runtime-wiring tasks are siblings under 2B. Drops T6D from the graph to match the resolved/invalidated text. Demotes the 1.11->2B.1 edge from a dedicated arrow to a soft-conflict note. Splits the Phase 8 prerequisite into 8B/8C/8D/8E with per-task dotted edges. Adds a soft-conflicts table for file-level overlaps in L1. Recomputes the critical path as two independent chains, with chain B's depth set by the external Stage 3 plan.
Adds a scope note that intra-task ordering (e.g. 6B's TDD sequence) is not modeled here. Closes the last open item from the adversarial review.
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Captures the dependency structure of the 2026-03-10 phase 9 health
review remediation plan: prerequisites, intra-stage ordering (1.11
after all other Stage 1, 2A.2 after 2A.1, 2B.1 after 1.11, 2C wiring
after 2B refactors, 3.x after the OpenAPI gate and 3.0 reference, 6C
after Stage 3), the topological layers a coordinator can fan out, and
the critical path.