feat: add generated scene skill platform hardening

docs/superpowers/plans/2026-04-19-final-2-residual-roadmap-prioritization-plan.md

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+# Final 2 Residual Roadmap Prioritization Plan
+
+> Date: 2026-04-19
+> Parent Framework: `2026-04-19-scene-skill-102-full-coverage-framework-plan.md`
+> Parent Sequence: `2026-04-19-final-2-residual-child-plan-sequence-plan.md`
+> Status: Draft
+
+## Plan Intent
+
+Select the next residual roadmap from the final two structured fail-closed records.
+
+## Fixed Input Bucket
+
+1. `sweep-085-scene`: host-bridge runtime residual
+2. `sweep-091-scene`: bootstrap target normalization residual
+
+## Allowed Files
+
+1. `tests/fixtures/generated_scene/final_2_residual_roadmap_prioritization_2026-04-19.json`
+2. `docs/superpowers/reports/2026-04-19-final-2-residual-roadmap-prioritization-report.md`
+
+## 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 the current official board.
+2. Extract the two residuals.
+3. Score bootstrap normalization vs host-bridge runtime.
+4. Select exactly one first roadmap.
+5. Publish decision JSON.
+6. Publish decision report.
+
+## Expected Delta
+
+No coverage delta. This is a decision-only plan.
+
+## Stop Statement
+
+Stop after the prioritization asset and report are published. Do not start the selected roadmap under this plan.