# Generated Scene Parameter Default Semantics Hardening Plan

> Date: 2026-04-20
> Status: Draft
> Parent route:
> - `parameter_default_semantics_recovery_hardening`
> Parent ledger:
> - `tests/fixtures/generated_scene/generated_scene_source_first_runtime_semantics_ledger_2026-04-20.json`

## Plan Intent

Implement the first reusable slice for page-native default period/date/mode recovery.

## Fixed Input Bucket

Use the bounded bucket:

1. scenes with explicit `period` parameters
2. scenes whose source evidence shows implicit month/week/date initialization
3. scenes whose current generated manifests do not encode a reusable default strategy

This first slice should center on the parameterized monthly/weekly scenes highlighted by the ledger.

## Allowed Files

1. `src/generated_scene/analyzer.rs`
2. `src/generated_scene/generator.rs`
3. `src/generated_scene/ir.rs`
4. route-local generator tests

## Forbidden Files

1. no runtime resolver patching outside generation metadata needs
2. no edits to generated skill bundle under `examples/`
3. no board assets
4. no pseudo-production assets

## Expected Coverage Delta

1. generated parameter metadata can preserve source-side default semantics for the bucketed scenes
2. callers are no longer forced to supply values that the source page itself normally supplies

## Stop Statement

Stop after the first reusable default-semantics slice is implemented and route-local follow-up assets are published.

Do not expand to all possible date semantics inside this route plan.