feat: add generated scene skill platform hardening

docs/superpowers/specs/2026-04-20-sweep-012-materialization-recovery-design.md

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+# Sweep 012 Materialization Recovery Design
+
+> Date: 2026-04-20
+> Parent Plan: `2026-04-19-scene-skill-102-final-materialization-plan.md`
+
+## Intent
+
+Recover the single failed final materialization package:
+
+`sweep-012-scene / 业扩报装管理制度`
+
+The official framework board expects this scene to be `paginated_enrichment / A`, but final materialization fell into `host_bridge_workflow / C` and failed before writing required skill files.
+
+## Scope
+
+Allowed:
+
+1. Diagnose why this one scene materializes as `host_bridge_workflow`.
+2. Apply the smallest bounded correction needed for this scene to materialize.
+3. Re-run only `sweep-012-scene` into the existing final materialization root.
+4. Refresh final materialization manifest, failures asset, human-readable index, and deterministic readiness for this scene.
+5. Publish a recovery report.
+
+Forbidden:
+
+1. Do not rerun all 102 scenes.
+2. Do not change other scene packages unless shared metadata refresh requires aggregate indexes.
+3. Do not start static, mock, or production validation.
+4. Do not update the official execution board.
+5. Do not create a new family.
+
+## Completion Criteria
+
+1. `sweep-012-scene` has `SKILL.toml`, `SKILL.md`, `scene.toml`, and at least one script.
+2. `sweep-012-scene` deterministic suffix is `。。。`.
+3. Full-name deterministic dispatch selects `sweep-012-scene`.
+4. Final materialization failure count becomes `0`.