test(mcp): wire pytest-asyncio, install [mcp] in CI so MCP tests run

Author: nikolay-e

.github/workflows/ci.yml

@@ -166,9 +166,9 @@ jobs:
           PYO3_USE_ABI3_FORWARD_COMPATIBILITY: "1"
         run: |
           # PEP 660 editable install — maturin builds the Rust extension and
-          # pip installs everything (diffctx + [dev,full] extras). Skip build
+          # pip installs everything (diffctx + [dev,full,mcp] extras). Skip build
           # isolation since we just installed maturin in this env.
-          pip install -e ".[dev,full]" --no-build-isolation
+          pip install -e ".[dev,full,mcp]" --no-build-isolation
 
       - name: Run Tests with Coverage
         shell: bash

pyproject.toml

@@ -67,6 +67,7 @@ optional-dependencies.dev = [
   "pre-commit>=3.0,<5.0",
   "pygit2>=1.12,<2.0",
   "pytest>=7.0,<10.0",
+  "pytest-asyncio>=0.23,<2.0",
   "pytest-cov>=3.0,<8.0",
   "pytest-timeout>=2.1,<3.0",
   "pytest-xdist>=3.0,<4.0",
@@ -155,6 +156,7 @@ ini_options.norecursedirs = [ "mutants", ".git", ".mypy_cache", ".pytest_cache",
 ini_options.addopts = "-n auto --dist worksteal"
 ini_options.truncation_limit_lines = 100
 ini_options.timeout = 10
+ini_options.asyncio_mode = "auto"
 
 [tool.coverage]
 run.branch = true