execplan-decomposelisted

Use this skill only when creating or improving an ExecPlan for work with real sequencing constraints, migration risk, or nontrivial validation requirements. Do not use this skill for: - simple bug fixes - small isolated edits - straightforward tasks with no real sequencing constraints ## Goal Improve the quality of the final ExecPlan by doing a compact decomposition first. The decomposition is a means, not the output. The output should be a better ExecPlan in this repository's expected format. ## Required workflow 1. Read `AGENTS.md`, `ARCHITECTURE.md`, and `docs/PLANS.md` first. 2. Carry forward: - hard constraints - major risks and unknowns - sequencing implications - validation requirements 3. Identify the task structure: - prerequisite or foundation work - branches that can proceed independently - integration or synthesis points - validation, observability, rollout, and rollback work 4. Convert that structure into the ExecPlan: - milestones in dependency order - explicit assumptions and unknowns - concrete verification commands - recovery or rollback notes when relevant 5. Prefer repository-specific grounding over abstract planning language. 6. If uncertainty remains, encode it as an investigation milestone rather than pretending it is resolved.