feat: add generated scene skill platform hardening

docs/superpowers/plans/2026-04-19-residual-runtime-roadmap-prioritization-plan.md

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+# Residual Runtime Roadmap Prioritization Plan
+
+> Date: 2026-04-19
+> Parent Framework: `2026-04-19-scene-skill-102-full-coverage-framework-plan.md`
+> Parent Layer: `Layer E`
+> Status: Active
+
+## Plan Intent
+
+Select the next roadmap from the three residual inputs after official board reconciliation.
+
+## Fixed Inputs
+
+1. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+2. `tests/fixtures/generated_scene/official_board_reconciliation_2026-04-19.json`
+
+## Allowed Files
+
+1. `tests/fixtures/generated_scene/residual_runtime_roadmap_prioritization_2026-04-19.json`
+2. `docs/superpowers/reports/2026-04-19-residual-runtime-roadmap-prioritization-report.md`
+3. selected next roadmap design
+4. selected next roadmap plan
+
+## Forbidden Files
+
+1. `src/generated_scene/analyzer.rs`
+2. `src/generated_scene/generator.rs`
+3. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+
+## Tasks
+
+1. Load official board residual records.
+2. Group residuals by next action.
+3. Score local-doc runtime, host-bridge runtime, and bootstrap target normalization.
+4. Select exactly one next roadmap.
+5. Publish prioritization JSON.
+6. Publish prioritization report.
+7. Create design/plan for the selected roadmap only.
+
+## Completion Criteria
+
+1. All `7` residual records are represented.
+2. Exactly one selected roadmap exists.
+3. Non-selected roadmaps are deferred with reasons.
+4. No implementation file is modified.
+
+## Stop Statement
+
+Stop after prioritization assets and the selected next roadmap design/plan are published. Do not execute the selected roadmap under this plan.