Redesign pre-commit commands to run through Task (#6670)

# Description of Changes
The `pre-commit` commands in this repo are inconsistent with the rest of
the dev workflow, as they are impossible to run through Task and they
can cause CI to fail with no way for a developer to run the `pre-commit`
scripts after they've failed. This PR adds `task pre-commit` (and `task
pre-commit:fix`) and then hooks up the existing `pre-commit` hooks and
CI to call the Task rule, so if developers are using pre-commit hooks
then they should still work, but they're also runnable without using
pre-commit at all.

I think it'd be worth reviewing what we're actually running at
pre-commit in the future because I'm not entirely convinced by all of
the scripts that we are running, but this should at least make what we
have properly enforced and usable by all devs.

scripts/pre-commit/pyproject.toml

@@ -0,0 +1,16 @@
+# Pinned Python lint/format tools for `task pre-commit`. uv.lock locks these
+# plus their transitive dependencies by hash, so `uv run --project
+# scripts/pre-commit --locked <tool>` is reproducible and integrity-checked.
+# This is not a packaged project - it only exists to lock the tooling.
+[project]
+name = "stirling-precommit-tools"
+version = "0"
+requires-python = ">=3.11"
+dependencies = [
+    "ruff==0.15.14",
+    "codespell==2.4.2",
+    "toml-sort==0.24.4",
+]
+
+[tool.uv]
+package = false