# Generated Scene Parameter Default Semantics Hardening Report

## Scope

Executed the first reusable slice defined by `2026-04-20-generated-scene-parameter-default-semantics-hardening-plan.md`.

Bounded scope:

- source-side recovery of default period semantics for parameterized monthly/weekly scenes
- generator-side preservation of recovered default strategy in param metadata
- route-local validation on the `sweep-030-scene` anchor

Out of scope:

- runtime resolver logic changes
- materialized skill refresh under `examples/`
- 102-scene rematerialization
- validation refresh

## Outcome

This route now preserves source-derived default period semantics in generated parameter metadata.

The first reusable slice is closed for the route anchor:

- `extract_deterministic_scene_facts(...)` now emits `period_default_strategy`
- line-loss style month/week source evidence recovers `lineloss_page_semantics`
- generated `month_week_period` params now write `resolver_config.default_strategy`
- real `sweep-030-scene` generation writes `default_strategy = "lineloss_page_semantics"` into `scene.toml`

## Files Changed

- `src/generated_scene/analyzer.rs`
- `src/generated_scene/generator.rs`
- `tests/scene_generator_test.rs`

## Verification

Passed:

```powershell
cargo test --test scene_generator_test analyzer_recovers_lineloss_period_default_strategy_from_source -- --nocapture
cargo test --test scene_generator_test generator_writes_real_sweep_030_org_dictionary_from_embedded_source -- --nocapture
cargo test --test scene_generator_modes_test -- --nocapture
```

## Route-Local Notes

- The route preserves generation metadata only; runtime period resolution logic was not modified here.
- The first slice is intentionally limited to the recovered line-loss page semantics pattern.
- Existing repository warnings remain unchanged, including `dead_code` warnings in callback-host/openxml code and an existing `unreachable_code` warning in `tests/scene_generator_test.rs`.