feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-19-promotion-and-board-reconciliation-policy-report.md

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+# Promotion And Board Reconciliation Policy Report
+
+Date: 2026-04-19
+
+Parent framework: `2026-04-19-scene-skill-102-full-coverage-framework-plan`
+
+Parent route: `Route 6 / promotion and board reconciliation`
+
+Plan: `2026-04-19-promotion-and-board-reconciliation-policy-plan.md`
+
+## Scope
+
+This is a policy-only route. It defines how later reconciliation may update official scene-state assets.
+
+This route did not:
+
+- modify `src/generated_scene/analyzer.rs`
+- modify `src/generated_scene/generator.rs`
+- update `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+- promote any scene
+
+## Policy Inputs
+
+The policy covers these status inputs:
+
+- `auto-pass`
+- `fail-closed-known`
+- `adjudicated-valid-host-bridge`
+- `timeout-as-pass-candidate`
+- `timeout-as-fail-closed-candidate`
+- `timeout-still-unreadable`
+- `timeout-rerun-error`
+
+## Promotion Thresholds
+
+| Input status | Candidate board status | Auto-update board |
+| --- | --- | --- |
+| `auto-pass` | `framework-auto-pass-candidate` | no |
+| `fail-closed-known` | `framework-structured-fail-closed` | no |
+| `adjudicated-valid-host-bridge` | `framework-valid-host-bridge` | no |
+| `timeout-as-pass-candidate` | `hygiene-pass-candidate` | no |
+| `timeout-as-fail-closed-candidate` | `hygiene-fail-closed-candidate` | no |
+
+## Board Update Rules
+
+1. Diagnostic reruns, hygiene interpretations, and route-local follow-ups cannot directly update the official execution board.
+2. Board changes require a dedicated reconciliation plan that names source assets and target statuses.
+3. Pass-like promotion requires complete generation evidence under the agreed sweep or validation budget.
+4. Structured fail-closed is framework-supported coverage, not execution pass.
+5. Adjudicated host-bridge scenes remain host-bridge classified unless a later implementation closes their original expected contract.
+
+## Timeout Hygiene Representation
+
+Raw `source-unreadable` status must be preserved. A hygiene-aware status can be published alongside it:
+
+- `timeout-as-pass-candidate`
+- `timeout-as-fail-closed-candidate`
+- `timeout-still-unreadable`
+- `timeout-rerun-error`
+
+## Structured Fail-Closed Representation
+
+Structured fail-closed is recognized framework coverage when:
+
+- a generation report exists
+- the blocker is named
+- missing pieces or failed gates are recorded
+- a diagnostic payload such as `contractSnapshot` is available
+
+It is not an execution pass.
+
+## Stop Statement
+
+Route 6 policy is published. Do not update the execution board under this plan.