feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-19-boundary-fail-closed-decision-report.md

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+# Boundary Fail-Closed Decision Report
+
+Date: 2026-04-19
+
+Parent framework: `2026-04-19-scene-skill-102-full-coverage-framework-plan`
+
+Parent route: `Route 5 / boundary-family fail-closed`
+
+Plan: `2026-04-19-boundary-fail-closed-decision-plan.md`
+
+## Scope
+
+This is a decision-only route. It does not change analyzer/generator code and does not update the execution board.
+
+Fixed Route 5 input buckets:
+
+| Bucket | Count |
+| --- | ---: |
+| `local_doc_pipeline` | 5 |
+| `host_bridge_workflow` | 1 |
+| `page_state_eval/bootstrap_target` | 1 |
+
+## Decisions
+
+| Bucket | Decision | Reason |
+| --- | --- | --- |
+| `local_doc_pipeline` | `hold-as-boundary-fail-closed` | Requires local document runtime and attachment handling beyond the current full-coverage implementation routes. |
+| `host_bridge_workflow` | `hold-as-boundary-fail-closed` | Remaining boundary record depends on host bridge execution semantics outside this decision-only route. |
+| `page_state_eval/bootstrap_target` | `isolate-bootstrap-target` | Bootstrap target resolution is a separate navigation/login target problem and must stay isolated from contract recovery. |
+
+## Result
+
+Route 5 produces no code-level coverage delta. Its expected delta is decision quality:
+
+- unresolved boundary ambiguity: `0`
+- open boundary implementation slices: `0`
+- held/deferred boundary records: `7`
+
+## Boundary
+
+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`
+- start boundary implementation
+- create a new family
+
+## Stop Statement
+
+Route 5 is decision-complete. The next child plan in the 102 full-coverage sequence is Route 6:
+
+`2026-04-19-promotion-and-board-reconciliation-policy-plan.md`