feat: add generated scene skill platform hardening

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

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+# G3 Export Plan 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-export-plan-closure-design.md`
+
+## Plan Intent
+
+Implement the second bounded `G3` contract-recovery slice by recovering repeated export-plan evidence gaps inside the remaining `paginated_enrichment` fail-closed bucket.
+
+## Fixed Input Bucket
+
+`paginated_enrichment + g3_export_plan + export_plan`
+
+## 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 follow-up JSON and report assets
+
+## Forbidden Files
+
+1. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+2. Route 3+ plan files
+3. promotion policy assets
+
+## Tasks
+
+1. freeze the targeted export-plan subgroup
+2. confirm repeated `export_plan` and `g3_export_plan` missing pattern
+3. implement one bounded export-plan recovery slice
+4. rerun bounded validation only for this subgroup
+5. publish delta and residual Route 2 inventory
+
+## Expected Coverage Delta
+
+1. reduce the count of `paginated_enrichment` records whose primary blocker is export-plan absence
+2. preserve stable `G3` canonical and real-sample anchors
+
+## Completion Criteria
+
+1. export-plan subgroup count is lower or more narrowly classified
+2. residual Route 2 bucket is explicitly measured
+
+## Stop Statement
+
+Stop after the export-plan subgroup has been rerun and measured.
+
+Do not continue into Route 2 residual closure under this plan.
+