Phase 4 Runs

Per-run implementation plans for Phase 4 — Runtime Platform Updates, sequenced as a five-PR rollout. Numbers 4 and 5 are intentionally vacant (the original per-partition rollout runs were consolidated into run-3-operator-cascade).

• Run 1 — Workspace Refactors
• Run 2 — Dev Rollout
• Run 3 — Operator Cascade
• Run 6 — Drift Workflow
• Run 7 — Documentation