# S02 Post-Slice Roadmap Assessment

**Verdict: Roadmap holds. No changes needed.**

## Risk Retirement

S02 was designed to retire "Tree-sitter symbol extraction accuracy" — it did. 57 tests across all 6 languages verify all symbol kinds, scope chains, export detection, and edge cases (arrow functions, impl blocks, receiver methods, decorated functions, nested classes). Risk is fully retired.

## Success Criteria Coverage

All 7 success criteria have at least one remaining owning slice:

- Edit by symbol name → S05, S06
- Outline in one call → S03
- Zoom with caller/callee → S03
- Checkpoint/restore → S04
- Undo individual edit → S04, S05
- JSON stdin/stdout → validated (S01)
- npm install binary → S07

## Boundary Map Accuracy

One minor inaccuracy: boundary map references `src/queries/` with `.scm` files, but D012 embedded query patterns as inline `const &str` in `parser.rs`. This doesn't affect downstream slices — S03 and S05 consume through `FileParser`/`TreeSitterProvider`, not query files directly. Not worth a roadmap rewrite.

Actual S02 produces consumed by S03/S05:
- `src/parser.rs` — `FileParser` (parse + cache), `TreeSitterProvider` (implements `LanguageProvider`)
- `src/symbols.rs` — `Symbol`, `SymbolKind` (7 variants including TypeAlias), `Range`
- Entry points: `list_symbols(file_path)`, `resolve_symbol(file_path, name)`, `FileParser::extract_symbols(file_path)`

## Requirement Coverage

- R001 (persistent binary) — validated (S01)
- R002 (multi-language parsing) — validated (S02)
- R003–R012, R031, R034 — still correctly mapped to remaining slices
- No requirements invalidated, deferred, or newly surfaced

## Deviations Absorbed

- TypeAlias added as 7th SymbolKind — downstream slices must handle 7 variants in match arms. No structural impact.
- streaming-iterator dependency added — pattern established, no impact on remaining slices.

## Next Slice

S03 (Structural Reading) and S04 (Safety & Recovery) are both unblocked. S03 depends on S02 (just completed). S04 depends only on S01. Either can proceed next; S05 needs both.
