feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-19-real-sample-validation-roadmap-closure-report.md

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+# Real Sample Validation Roadmap Closure Report
+
+> Date: 2026-04-19
+> Roadmap: `docs/superpowers/plans/2026-04-18-scene-skill-real-sample-validation-roadmap-plan.md`
+> Result: Completed
+
+## 1. Conclusion
+
+This roadmap has been completed inside its boundary.
+
+All selected mainline anchors now have executed real-sample records:
+
+1. `G2`: executed mismatch
+2. `G1-E`: executed pass
+3. `G3`: executed mismatch
+
+## 2. Scope Decision
+
+The next bounded implementation scope should target:
+
+1. `G3` real-sample archetype correction
+2. `G2` real-sample contract correction
+
+## 3. Boundary Decision
+
+`G6/G7/G8` remain boundary families and do not enter the next roadmap.
+
+## 4. Deferred Decision
+
+`G4/G5` remain closed and do not enter the next roadmap.
+
+## 5. Updated Assets
+
+1. `tests/fixtures/generated_scene/real_sample_validation_records_2026-04-18.json`
+2. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+3. `tests/fixtures/generated_scene/boundary_runtime_entry_rules_2026-04-18.json`
+4. `docs/superpowers/reports/2026-04-19-g3-real-sample-execution-report.md`
+5. `docs/superpowers/reports/2026-04-19-real-sample-validation-triage-report.md`
+6. `docs/superpowers/reports/2026-04-19-boundary-runtime-entry-decision.md`
+7. `docs/superpowers/reports/2026-04-19-deferred-family-entry-decision.md`
+
+## 6. Final Status
+
+The strongest current execution pressure remains in the completed-roadmap mainline families.
+
+That means the next roadmap should stay bounded around mainline real-sample mismatch correction instead of drifting into boundary-family or deferred-family expansion.