Mirrors the Python DSL's hm.py.uv() — uv-managed Python projects
with run(), build(), lockCheck(), publish() methods.

Uses hm.py.uv() for Python DSL checks and hm.rust() for
workspace build/test/clippy/fmt. Demonstrates the new py.uv
namespace with run() escape hatch for custom pytest args.

Fix RUF022 (unsorted __all__) by moving "py" to correct
alphabetical position.

Add TypeScript variant of the dogfood CI pipeline alongside
the existing Python one.

Builds hm from source, installs harmont-py into system Python,
and executes .harmont/ci.py through the hm binary — the repo
now CI-tests itself through its own tool.

Drop fmt() (normal CI doesn't check formatting) and scope mypy
to package dir only (normal CI runs mypy harmont, not mypy .).

- typecheck(paths="src") or typecheck(paths=["src", "tests"]) to
  scope mypy to specific directories (defaults to "." as before)
- Applied to PythonToolchain and UvProject in both Python and TS DSLs
- ruff format across all harmont-py source and test files
- Dogfood pipelines now use typecheck(paths="harmont")

Move use-items before statements (items_after_statements) and
remove trailing commas in macro args (unnecessary_trailing_comma).

The full cargo test runs integration tests that need python3,
which isn't available in the bare Rust Docker container.

RustToolchain has no run() method; use installed step directly
with cargo env sourcing.