docs: close live projection convergence and retain capacity residual

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a07ff8-19d0-7820-b4d0-1353833cb7fc

workplans/STATE-WP-0091-release-headroom.md

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+---
+id: STATE-WP-0091
+type: workplan
+title: "Check release headroom and retain a capacity allocation handoff"
+domain: infotech
+repo: state-hub
+status: ready
+owner: codex
+topic_slug: infotech
+created: "2026-09-10"
+updated: "2026-09-10"
+related: [STATE-WP-0090, RCLUSTER-WP-0014, RESOURCE-WP-0003, HFACT-WP-0001]
+---
+
+Residual from STATE-WP-0090: revision 61 failed with Insufficient CPU even though
+runtime usage was modest. Revision 63 succeeded after a measured same-service
+MCP request adjustment. The single 4,000m node still reserves 3,895m (97.4%),
+leaving 105m against a 100m API surge. Existing cluster collection and portfolio
+contracts are finished inputs, not workplans to reopen. No factory capacity
+admission follows from this release.
+
+## Check scheduling headroom before State Hub promotion
+
+```task
+id: STATE-WP-0091-T01
+status: todo
+priority: high
+```
+
+Add a read-only preflight to the existing promotion path. Reuse Kubernetes and
+railiance-cluster capacity evidence; check effective pod requests, init/overhead,
+placement constraints, rollout surge and migration-hook ordering. Report observed
+freshness, remaining CPU/memory and precise insufficient-capacity reasons before
+starting Helm. Do not claim a scheduling guarantee from an aggregate sum or lower
+requests automatically. Prove the observed 65m refusal and 105m narrowly sufficient
+case, including unrelated concurrent demand. Keep atomic rollback.
+
+## Review sustained service demand and hand off shared capacity
+
+```task
+id: STATE-WP-0091-T02
+status: todo
+priority: high
+```
+
+State Hub owns its workload demand and release requirement. Check MCP latency,
+errors, CPU contention and coverage after the 50m-to-10m request change; its 500m
+limit, memory and replicas remain unchanged. The initial 1,078 five-minute samples
+are partial coverage, not a full week. Propose a durable release margin and hand
+any shared allocation or provisioning change to live records with railiance-cluster,
+railiance-platform and resource-control using their existing authority contracts.
+Include HFACT T01/T04 factory demand, other zero-request workloads and host usage;
+current aggregate reservation alone is not capacity admission. No unrelated
+allocation, procurement or scaling is authorized by this workplan. Close only
+after the repeatable preflight and explicit receiving work records are verified.
+
+Evidence: docs/evidence/2026-09-10-projection-convergence.json.