feat: add generated scene skill platform hardening

docs/superpowers/plans/2026-04-19-host-bridge-runtime-roadmap-plan.md

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+# Host-Bridge Runtime Roadmap 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`
+> Fixed Scene: `sweep-085-scene`
+> Status: Draft
+
+## Plan Intent
+
+Run a bounded host-bridge runtime slice for the single remaining `host_bridge_workflow` residual.
+
+## Fixed Input Bucket
+
+1. `sweep-085-scene`
+
+## Allowed Files
+
+1. `src/generated_scene/analyzer.rs`
+2. `src/generated_scene/generator.rs`
+3. `tests/scene_generator_test.rs`
+4. `tests/fixtures/generated_scene/host_bridge_runtime_followup_2026-04-19.json`
+5. `tests/fixtures/generated_scene/host_bridge_runtime_reconciliation_candidates_2026-04-19.json`
+6. `docs/superpowers/reports/2026-04-19-host-bridge-runtime-roadmap-report.md`
+
+## Forbidden Files
+
+1. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+
+## Tasks
+
+1. Freeze the current `sweep-085-scene` generation report.
+2. Identify the exact host-bridge runtime missing piece.
+3. Implement at most one bounded correction slice if it can be expressed in generated-scene contract or fail-closed reporting.
+4. Rerun only `sweep-085-scene`.
+5. Publish follow-up and reconciliation candidate assets.
+
+## Expected Delta
+
+Target delta is `+1 framework-auto-pass-candidate` if the host-bridge contract can be closed without full runtime transport. Otherwise the delta is `0`, with a narrower named runtime hold.
+
+## Stop Statement
+
+Stop after the single-scene follow-up and reconciliation candidates are published. Do not update the official board under this plan.