# Pathfinder v5.1 Final Audit & Hardening Report
**Date:** 2026-04-03
**Status:** COMPLETED & VERIFIED

## Executive Summary
A comprehensive file-by-file audit and dynamic hardening phase was successfully executed against the `pathfinder-v5.1-requirements.md`. All identified implementation gaps from the preliminary v5.1 reliability pass have been fully addressed and verified locally using `cargo clippy` and `cargo test`. 

**The codebase is now fully hardened for manual validation.**

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## Epic F1 — LSP Validation Reliability & Transparency
**Status: COMPLETELY IMPLEMENTED**
- The catch-all `lsp_error` in `edit.rs` (`run_lsp_validation`) has been completely removed.
- Valid skip reasons (`no_lsp`, `lsp_start_failed`, `lsp_crash`, `lsp_timeout`, `pull_diagnostics_unsupported`) are precisely routed based on the `LspError` variants.
- Testability expectations (`unfulfilled-lint-expectations` for `clippy::too_many_lines`) were satisfied and cleanly configured in the CI pipeline without throwing false positives.

## Epic F2 — Symbol Resolution Robustness
**Status: COMPLETELY IMPLEMENTED**
- `pathfinder-treesitter/src/symbols.rs` was heavily refactored to structurally merge `impl` blocks into their parent structs.
- The fragile `resolve_symbol_chain_with_impl_fallback` was completely removed from the pipeline.
- `crates/pathfinder-treesitter/src/treesitter_surgeon.rs` natively routes everything through standard resolution mechanisms, fully mitigating the `SYMBOL_NOT_FOUND` errors on structurally correct dot-notation paths.
- ALL tree-sitter extraction and formatting tests natively pass without panic hooks (`unwrap_used` was completely removed).

## Epic F3 — Dedicated `INVALID_SEMANTIC_PATH` Error Code
**Status: COMPLETELY IMPLEMENTED**
- Semantic path structural invariants correctly mapped and returning distinct error types instead of confusing `FILE_NOT_FOUND` routing.

## Epic F4 — `replace_batch` Schema Ergonomics
**Status: COMPLETELY IMPLEMENTED**
- Hybrid targeting (`text_target` vs `semantic_path`) correctly maps in `server/types.rs`.
- Extracted JSON schema seamlessly handles optional dependencies without colliding with deserialisation engines.

## Epic F5 — Proactive Capability Reporting
**Status: COMPLETELY IMPLEMENTED**
- Added proactive capability degradation checks in `repo_map.rs`.
- The missing git degradation (`get_changed_files_since`) helper was formally implemented in `pathfinder-common/src/git.rs`.
- Any underlying `git` failure cascades into a `degraded = true` state instead of panic loops or silent truncation.
- Git extensions properly hooked.

## Quality Control Output
- **Linters:** `cargo clippy --workspace --all-targets -- -D warnings` — **PASS**
- **Test Suite:** `cargo test --workspace` — **PASS**
- **Dead Code:** No orphaned modules detected.
- **Git Status:** Clean and staged. 

The system meets all PRD parameters required for manual operational validation.
