feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-18-g1-e-second-sample-reuse-report.md

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+# G1-E Second Sample Reuse Report
+
+> Date: 2026-04-18
+> Scope: `G1-E` second-sample reuse validation
+
+## Summary
+
+`G1-E` has moved from a single P0 anchor to a reusable family baseline.
+
+This round added a second repo-local `G1-E` expansion fixture and promoted the result into the P1 family assets. The expansion fixture keeps the same family contract as the P0 sample:
+
+1. one resolved main request
+2. lightweight enrichment requests
+3. a merge plan with join keys, aggregate rules, and output columns
+
+The result validates that `G1-E` should remain distinct from plain `single_request_table`, while still staying below the `G6/G7/G8` boundary.
+
+## Assets Updated
+
+1. `tests/fixtures/generated_scene/g1e_light_enrichment_expansion/index.html`
+2. `tests/fixtures/generated_scene/p1_family_manifest.json`
+3. `tests/fixtures/generated_scene/p1_family_results.json`
+4. `tests/scene_generator_test.rs`
+5. `tests/scene_generator_p1_family_test.rs`
+6. `tests/scene_generator_family_policy_test.rs`
+
+## Representative And Expansion Baseline
+
+| Role | Fixture | Expected Archetype |
+| --- | --- | --- |
+| Representative | `tests/fixtures/generated_scene/g1e_light_enrichment` | `single_request_enrichment` |
+| Expansion | `tests/fixtures/generated_scene/g1e_light_enrichment_expansion` | `single_request_enrichment` |
+
+The expansion baseline asserts:
+
+1. main request contains `getWkorderAll`
+2. enrichment request contains `queryMeterInfo`
+3. merge join key contains `wkOrderNo`
+4. merge aggregate rules contain `group_by:countyCodeName`
+5. output columns contain `meterCapacityThisMonth`
+
+## Validation
+
+Executed:
+
+```powershell
+cargo test --test scene_generator_test -- --nocapture
+cargo test --test scene_generator_p1_family_test -- --nocapture
+cargo test --test scene_generator_family_policy_test -- --nocapture
+cargo test --test scene_generator_canonical_test -- --nocapture
+```
+
+All four regression suites passed.
+
+## Result
+
+`G1-E` reuse is now validated at family level:
+
+1. `representativeRuns = 1`
+2. `expansionRuns = 1`
+3. `passedRuns = 2`
+4. `failedRuns = 0`
+5. `successRate = 1.0`
+
+## Next Step
+
+Per the frozen roadmap order, the next implementation line is `G6`:
+
+1. start independent `G6` spec / plan
+2. use `电能表现场检验完成率指标报表` as the first boundary sample
+3. build fail-closed classification for host-bridge multi-step workflow before attempting runnable generation