Eng manager-mode plan review. Lock in the execution plan — architecture,
data flow, diagrams, edge cases, test coverage, performance, observability,
deployment. Walks through issues interactively with opinionated recommendations.
CHANGELOG:
1.1.0 — Added §5 Observability & Debuggability and §6 Deployment & Rollout
(folded down from plan-ceo-review and re-framed for "is this
implementable safely?" lens vs CEO's "should we ship this?").
1.0.0 — Initial release: Architecture, Code Quality, Tests, Performance.
