feat: add generated scene skill platform hardening

docs/superpowers/specs/2026-04-19-promotion-and-board-reconciliation-policy-design.md

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+# Promotion And Board Reconciliation Policy Design
+
+> Date: 2026-04-19
+> Status: Draft
+> Parent Framework Plan: `docs/superpowers/plans/2026-04-19-scene-skill-102-full-coverage-framework-plan.md`
+> Parent Route: `Route 6: promotion and board reconciliation`
+> Parent Layer: `Layer E`
+
+## Intent
+
+Define how stronger framework-resolved statuses may update the official scene state representation without over-promoting diagnostics.
+
+## Fixed Input Bucket
+
+This route owns policy, not an archetype bucket.
+
+Fixed policy inputs:
+
+1. `auto-pass`
+2. `fail-closed-known`
+3. `adjudicated-valid-host-bridge`
+4. hygiene-aware timeout interpretation
+
+## Allowed Files
+
+1. policy design and policy plan docs
+2. reconciliation-policy JSON assets
+3. policy reports
+
+## Forbidden Files
+
+1. `src/generated_scene/analyzer.rs`
+2. `src/generated_scene/generator.rs`
+3. direct scene promotion inside `scene_execution_board_2026-04-18.json`
+
+## Expected Delta
+
+Policy-only delta:
+
+1. future board updates become rule-driven
+2. diagnostics and promotion are no longer conflated
+
+## Stop Rule
+
+Stop after the policy rules are published.
+
+Do not apply policy updates to the execution board under this plan.
+