feat: add generated scene skill platform hardening

docs/superpowers/plans/2026-04-19-g3-residual-contract-closure-plan.md

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+# G3 Residual Contract Closure Plan
+
+> Date: 2026-04-19
+> Status: Draft
+> Parent Framework Plan: `docs/superpowers/plans/2026-04-19-scene-skill-102-full-coverage-framework-plan.md`
+> Parent Route: `Route 2: G3 / paginated_enrichment`
+> Parent Layer: `Layer C + Layer D`
+> Upstream Design: `docs/superpowers/specs/2026-04-19-g3-residual-contract-closure-design.md`
+
+## Plan Intent
+
+Implement the final bounded Route 2 slice for any `G3` residual contract blockers left after enrichment-request and export-plan closure work.
+
+## Fixed Input Bucket
+
+Residual `G3 / paginated_enrichment` bucket after the first two Route 2 child plans.
+
+## Allowed Files
+
+1. `src/generated_scene/analyzer.rs`
+2. `src/generated_scene/generator.rs`
+3. `src/generated_scene/ir.rs`
+4. `tests/scene_generator_test.rs`
+5. route-local residual inventory and report assets
+
+## Forbidden Files
+
+1. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+2. Route 3+ implementation assets
+
+## Tasks
+
+1. freeze post-Route-2 residual inventory
+2. group residual blockers
+3. implement at most one bounded residual correction slice
+4. rerun bounded validation
+5. declare Route 2 complete or deferred
+
+## Expected Coverage Delta
+
+1. shrink or explicitly name the final residual `G3` bucket
+2. produce a clean handoff into Route 3
+
+## Completion Criteria
+
+1. Route 2 is no longer open-ended
+2. remaining residual `G3` records are explicitly categorized
+
+## Stop Statement
+
+Stop after Route 2 is explicitly closed or deferred.
+
+Do not begin Route 3 work under this plan.
+