build: type-check with ty in a pre-commit hook

ty joins the dev dependency group, locked at 0.0.89, and a local
hook runs `uv run ty check` over the whole project whenever Python
files change. [tool.ty.src] limits the check to pqcli/ and tests/,
so agent worktrees under .claude/ are not checked as duplicate
copies of the project.

.pre-commit-config.yaml

@@ -12,6 +12,12 @@ repos:
 
 - repo: local
   hooks:
+  - id: ty
+    name: ty
+    entry: uv run ty check
+    language: system
+    pass_filenames: false
+    types: [python]
   - id: commit-msg-50-72
     name: Commit message 50/72 rule
     entry: python3 .prek/check_commit_msg

pyproject.toml

@@ -40,7 +40,12 @@ requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [dependency-groups]
-dev = ["prek>=0.2", "pytest>=8.0"]
+dev = ["prek>=0.2", "pytest>=8.0", "ty>=0.0.89"]
+
+[tool.ty.src]
+# Only the package and its tests; agent worktrees under .claude/ would
+# otherwise be checked as duplicate copies of the project.
+include = ["pqcli", "tests"]
 
 [tool.ruff]
 line-length = 79

uv.lock

@@ -159,6 +159,7 @@ windows = [
 dev = [
     { name = "prek" },
     { name = "pytest" },
+    { name = "ty" },
 ]
 
 [package.metadata]
@@ -175,6 +176,7 @@ provides-extras = ["windows"]
 dev = [
     { name = "prek", specifier = ">=0.2" },
     { name = "pytest", specifier = ">=8.0" },
+    { name = "ty", specifier = ">=0.0.89" },
 ]
 
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 ]
 
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 [[package]]
 name = "typing-extensions"
 version = "4.15.0"