feat: add generated scene skill platform hardening

docs/superpowers/specs/2026-04-19-g3-enrichment-request-closure-design.md

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+# G3 Enrichment Request Closure Design
+
+> 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`
+
+## Intent
+
+Reduce the largest repeated `G3 / paginated_enrichment` fail-closed subgroup by recovering missing enrichment-request contract evidence without relaxing gates.
+
+## Fixed Input Bucket
+
+Primary bucket:
+
+`paginated_enrichment + g3_enrichment_contract + secondary_request`
+
+This child plan targets the repeated scenes whose structured fail-closed state shows:
+
+1. `g3_enrichment_contract_complete` failed
+2. request/response contract failed because `secondary_request` is missing
+
+## Current Pattern
+
+The current follow-up assets show a repeated subgroup where:
+
+1. a main paginated scene is recognized
+2. primary request shape is sufficiently visible to classify as `paginated_enrichment`
+3. enrichment request extraction is not closed
+4. secondary response extraction is not closed
+
+This is the first recovery slice because it appears more frequently than the export-plan-specific slice.
+
+## 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 sweep follow-up assets created by this plan
+6. route-local reports created by this plan
+
+## Forbidden Files
+
+1. `tests/fixtures/generated_scene/scene_execution_board_2026-04-18.json`
+2. unrelated family manifests and promotion assets
+3. Route 3, Route 4, Route 5, and Route 6 plan files
+
+## Expected Delta
+
+Expected delta is measured only against the Route 2 bucket:
+
+1. some `paginated_enrichment` fail-closed records should move from `g3_enrichment_contract` to either:
+   - `auto-pass`, or
+   - a narrower remaining contract blocker
+2. no current `G3` canonical or real-sample pass may regress
+
+## Stop Rule
+
+Stop after:
+
+1. the targeted subgroup is rerun in a bounded way
+2. coverage delta is measured
+3. remaining unresolved `G3` fail-closed scenes are left for the next Route 2 child plan
+
+Do not absorb export-plan-specific work into this plan unless it is strictly required to preserve contract coherence for the targeted subgroup.
+