diff --git a/pyproject.toml b/pyproject.toml
index 7b91a3f..d50e870 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,7 @@ dev = [
     "pytest",
     "mypy>=1.20.1",
     "coverage>=7.15.2",
+    "pytest-impacted>=0.35.0",
 ]
 # Playwright runs the browser integration test and the JavaScript unit tests (--js-tests).
 playwright = [
diff --git a/uv.lock b/uv.lock
index 9a09dc6..9f83298 100644
--- a/uv.lock
+++ b/uv.lock
@@ -58,6 +58,15 @@ wheels = [
 ]
 
 [[package]]
+name = "astroid"
+version = "4.3.4"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/2d/87/5732fa68bf100a095cfcbd108f919220d995db99e1a7502b8119a869fd62/astroid-4.3.4.tar.gz", hash = "sha256:d515a105722b72098bbe82d430d65e635f742b6cbac3bdfaf8b7c188b87c5e39", size = 444627, upload-time = "2026-10-08T09:36:44.122Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/16/d4/f23c0ac6e6de33ba5686cb21c672c95e0c2d3d4c9351f16d3b5fed818652/astroid-4.3.4-py3-none-any.whl", hash = "sha256:2bcd0d02648a443a4b818c952c3550091989daefac3c12d3b83b2289482e0818", size = 288310, upload-time = "2026-10-08T09:36:42.284Z" },
+]
+
+[[package]]
 name = "attrs"
 version = "26.1.0"
 source = { registry = "https://pypi.org/simple" }
@@ -342,6 +351,30 @@ standard-no-fastapi-cloud-cli = [
 ]
 
 [[package]]
+name = "gitdb"
+version = "4.0.12"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "smmap" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/72/94/63b0fc47eb32792c7ba1fe1b694daec9a63620db1e313033d18140c2320a/gitdb-4.0.12.tar.gz", hash = "sha256:5ef71f855d191a3326fcfbc0d5da835f26b13fbcba60c32c21091c349ffdb571", size = 394684, upload-time = "2025-01-02T07:20:46.413Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/a0/61/5c78b91c3143ed5c14207f463aecfc8f9dbb5092fb2869baf37c273b2705/gitdb-4.0.12-py3-none-any.whl", hash = "sha256:67073e15955400952c6565cc3e707c554a4eea2e428946f7a4c162fab9bd9bcf", size = 62794, upload-time = "2025-01-02T07:20:43.624Z" },
+]
+
+[[package]]
+name = "gitpython"
+version = "3.2.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "gitdb" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c0/ff/fee293f1ec3e1b64db6eb270e00964f29c086d769201474cedb8d1608930/gitpython-3.2.1.tar.gz", hash = "sha256:0f1229ec5c057bdabdeeda8bda4f17bda679ab33dbccc00f24e6a480553c8613", size = 241688, upload-time = "2026-10-14T12:20:20.589Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/6b/50/2a923c4dc02522ff9567f07c67ed1deca6d5fa9474f4708168b8088dfa37/gitpython-3.2.1-py3-none-any.whl", hash = "sha256:d66b0832aa8755c1a84892937282df0befb16c97e5a64aeebd68be9c5e323f53", size = 231548, upload-time = "2026-10-14T12:20:18.844Z" },
+]
+
+[[package]]
 name = "greenlet"
 version = "3.5.6"
 source = { registry = "https://pypi.org/simple" }
@@ -762,6 +795,15 @@ wheels = [
 ]
 
 [[package]]
+name = "networkx"
+version = "3.7"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/dc/76/3af777226b63a5e64a6b36b1ec5855c14e2b94a37096d4760e595fc43511/networkx-3.7.tar.gz", hash = "sha256:fd77a511bd90f39f3d016351345b52cf5319b813bdca01de3f755d3cca62e96a", size = 1866482, upload-time = "2026-09-21T16:45:16.974Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7e/cd/fe58041e9011f307c490e3e17dd48cc516448f7c698a3f2d9d9d65d7e6a8/networkx-3.7-py3-none-any.whl", hash = "sha256:e3fd2c13a7814cee3746340d8d7f8598a67f16a58bf47fb7f8793fab6efca1b0", size = 2142205, upload-time = "2026-09-21T16:45:14.609Z" },
+]
+
+[[package]]
 name = "orjson"
 version = "3.11.8"
 source = { registry = "https://pypi.org/simple" }
@@ -1193,6 +1235,7 @@ dev = [
     { name = "coverage" },
     { name = "mypy" },
     { name = "pytest" },
+    { name = "pytest-impacted" },
     { name = "ruff" },
 ]
 playwright = [
@@ -1206,6 +1249,7 @@ dev = [
     { name = "coverage", specifier = ">=7.15.2" },
     { name = "mypy", specifier = ">=1.20.1" },
     { name = "pytest" },
+    { name = "pytest-impacted", specifier = ">=0.35.0" },
     { name = "ruff" },
 ]
 playwright = [{ name = "playwright", specifier = "==1.63.0" }]
@@ -1264,6 +1308,23 @@ wheels = [
 ]
 
 [[package]]
+name = "pytest-impacted"
+version = "0.35.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "astroid" },
+    { name = "click" },
+    { name = "gitpython" },
+    { name = "networkx" },
+    { name = "pytest" },
+    { name = "rich" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/cd/a8/f7d43b0038ae19a9f054ca8afca367556d7f56bf9e8bf3cddee4857f5d82/pytest_impacted-0.35.0.tar.gz", hash = "sha256:c4f5d724e6bdb6a9c68e7b1d947c22a8624ec55429f4ae2d1087777e0e1d7fce", size = 847907, upload-time = "2026-10-01T06:14:42.759Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/95/e9/57670a0606bc2a30330be33b759894a951caf5f00b7bb2a712f763c9f97a/pytest_impacted-0.35.0-py3-none-any.whl", hash = "sha256:4569b2cdad6bde372748903bf6796d0954bb9865eb9143ac59040dfa257ef03a", size = 785125, upload-time = "2026-10-01T06:14:41.241Z" },
+]
+
+[[package]]
 name = "python-dotenv"
 version = "1.2.2"
 source = { registry = "https://pypi.org/simple" }
@@ -1554,6 +1615,15 @@ wheels = [
 ]
 
 [[package]]
+name = "smmap"
+version = "5.0.3"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/1f/ea/49c993d6dfdd7338c9b1000a0f36817ed7ec84577ae2e52f890d1a4ff909/smmap-5.0.3.tar.gz", hash = "sha256:4d9debb8b99007ae47165abc08670bd74cb74b5227dda7f643eccc4e9eb5642c", size = 22506, upload-time = "2026-03-09T03:43:26.1Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c1/d4/59e74daffcb57a07668852eeeb6035af9f32cbfd7a1d2511f17d2fe6a738/smmap-5.0.3-py3-none-any.whl", hash = "sha256:c106e05d5a61449cf6ba9a1e650227ecfb141590d2a98412103ff35d89fc7b2f", size = 24390, upload-time = "2026-03-09T03:43:24.361Z" },
+]
+
+[[package]]
 name = "sse-starlette"
 version = "3.4.5"
 source = { registry = "https://pypi.org/simple" }