# Step 1.5: Module Layout (default mode only)

**Role**: Professional software architect
**Goal**: Produce `_docs/02_document/module-layout.md` — the authoritative file-ownership map used by the implement skill. Separates **behavioral** task specs (no file paths) from **structural** file mapping (no behavior).
**Constraints**: Follow the target language's standard project-layout conventions. Do not invent non-standard directory structures.

## Steps

1. Detect the target language from `DOCUMENT_DIR/architecture.md` and the bootstrap structure plan produced in Step 1.
2. Apply the language's conventional layout (see table in `templates/module-layout.md`):
   - Python → `src/<pkg>/<component>/`
   - C# → `src/<Component>/`
   - Rust → `crates/<component>/`
   - TypeScript / React → `src/<component>/` with `index.ts` barrel
   - Go → `internal/<component>/` or `pkg/<component>/`
3. Each component owns ONE top-level directory. Shared code goes under `<root>/shared/` (or language equivalent).
4. Public API surface = files in the layout's `public:` list for each component; everything else is internal and MUST NOT be imported from other components.
5. Cross-cutting concerns (logging, error handling, config, telemetry, auth middleware, feature flags, i18n) each get ONE entry under Shared / Cross-Cutting; per-component tasks consume them (see Step 2 cross-cutting rule).
6. Write `_docs/02_document/module-layout.md` using `templates/module-layout.md` format.

## Self-verification

- [ ] Every component in `DOCUMENT_DIR/components/` has a Per-Component Mapping entry
- [ ] Every shared / cross-cutting concern has a Shared section entry
- [ ] Layering table covers every component (shared at the bottom)
- [ ] No component's `Imports from` list points at a higher layer
- [ ] Paths follow the detected language's convention
- [ ] No two components own overlapping paths

## Save action

Write `_docs/02_document/module-layout.md`.

## Blocking

**BLOCKING**: Present layout summary to user. Do NOT proceed to Step 2 until user confirms. The implement skill depends on this file; inconsistencies here cause file-ownership conflicts at batch time.