refactor: migrate exec bridge to anyio and harden cancellation (#6)

uv.lock

@@ -331,6 +331,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/3b/ab/b3226f0bd7cdcf710fbede2b3548584366da3b19b5021e74f5bde2a8fa3f/pytest-9.0.2-py3-none-any.whl", hash = "sha256:711ffd45bf766d5264d487b917733b453d917afd2b0ad65223959f59089f875b", size = 374801, upload-time = "2025-12-06T21:30:49.154Z" },
 ]
 
+[[package]]
+name = "pytest-anyio"
+version = "0.0.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "anyio" },
+    { name = "pytest" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/00/44/a02e5877a671b0940f21a7a0d9704c22097b123ed5cdbcca9cab39f17acc/pytest-anyio-0.0.0.tar.gz", hash = "sha256:b41234e9e9ad7ea1dbfefcc1d6891b23d5ef7c9f07ccf804c13a9cc338571fd3", size = 1560, upload-time = "2021-06-29T22:57:30.846Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c6/25/bd6493ae85d0a281b6a0f248d0fdb1d9aa2b31f18bcd4a8800cf397d8209/pytest_anyio-0.0.0-py2.py3-none-any.whl", hash = "sha256:dc8b5c4741cb16ff90be37fddd585ca943ed12bbeb563de7ace6cd94441d8746", size = 1999, upload-time = "2021-06-29T22:57:29.158Z" },
+]
+
 [[package]]
 name = "pytest-cov"
 version = "7.0.0"
@@ -420,6 +433,7 @@ name = "takopi"
 version = "0.1.0"
 source = { editable = "." }
 dependencies = [
+    { name = "anyio" },
     { name = "httpx" },
     { name = "markdown-it-py" },
     { name = "rich" },
@@ -430,6 +444,7 @@ dependencies = [
 [package.dev-dependencies]
 dev = [
     { name = "pytest" },
+    { name = "pytest-anyio" },
     { name = "pytest-cov" },
     { name = "ruff" },
     { name = "ty" },
@@ -437,6 +452,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
+    { name = "anyio", specifier = ">=4.12.0" },
     { name = "httpx", specifier = ">=0.28.1" },
     { name = "markdown-it-py" },
     { name = "rich", specifier = ">=14.2.0" },
@@ -447,6 +463,7 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "pytest", specifier = ">=9.0.2" },
+    { name = "pytest-anyio", specifier = ">=0.0.0" },
     { name = "pytest-cov", specifier = ">=7.0.0" },
     { name = "ruff", specifier = ">=0.14.10" },
     { name = "ty", specifier = ">=0.0.8" },