chore: release v2.3.1 (#233)

Hotfix for the Windows long-running-MCP-tool hang that v2.2.4 only
partially fixed.

- #46 / #136 — converted 5 heavy MCP tools to async + asyncio.to_thread
  so the stdio event loop stays responsive during full builds,
  postprocessing, embeddings, change detection, and wiki generation.

@dev-limucc's v2.2.4 test on #136 showed read-only tools worked but
long-running ones still hung. Root cause: FastMCP 2.x dispatches sync
handlers inline on the only event-loop thread; a 10-second handler
freezes stdin/stdout for 10 seconds. Fix: wrap the work in
asyncio.to_thread so the loop keeps pumping.

Verified locally on Python 3.11 / macOS: ruff clean, mypy clean,
bandit clean, 737 tests (+2 new lock-in tests), coverage 74.63%.

Windows verification post-release — will ping @dev-limucc on #136
once 2.3.1 is live on PyPI.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: tirth8205

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## [Unreleased]
 
+## [2.3.1] - 2026-04-11
+
+Hotfix for the Windows long-running-MCP-tool hang that v2.2.4 only partially fixed.
+
+### Fixed
+- **Windows MCP hang on long-running tools** (PR #231, fixes #46, #136): follow-up to v2.2.4. [@dev-limucc reported on #136](https://github.com/tirth8205/code-review-graph/issues/136) that the `WindowsSelectorEventLoopPolicy` fix from v2.2.4 was necessary but not sufficient — read-only tools worked, but `build_or_update_graph_tool(full_rebuild=True)` and `embed_graph_tool` still hung indefinitely on Windows 11 / Python 3.14. Root cause: FastMCP 2.x dispatches sync handlers inline on the only event-loop thread, so handlers that run for more than a few seconds (especially those that spawn subprocesses or do CPU-bound inference) stop the loop from pumping stdin/stdout. **Fix**: converted the five heavy tools (`build_or_update_graph_tool`, `run_postprocess_tool`, `embed_graph_tool`, `detect_changes_tool`, `generate_wiki_tool`) to `async def` and offloaded the blocking work via `asyncio.to_thread`. The other 19 tools are fast SQLite-read paths and stay sync. Zero config, works on every platform. New regression tests assert the five tools are registered as coroutines AND that each one's source literally contains `asyncio.to_thread` as a defense-in-depth lock-in.
+
 ## [2.3.0] - 2026-04-11
 
 Additive feature release — new language parsers, new platform install target, MCP tool UX improvements, and out-of-tree graph storage. No breaking changes from v2.2.4.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "code-review-graph"
-version = "2.3.0"
+version = "2.3.1"
 description = "Persistent incremental knowledge graph for token-efficient, context-aware code reviews with Claude Code"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = "MIT"