Add incremental pyright type checking with CI enforcement

Add pyrightconfig.json with basic type checking for zero-error modules
(clocks, metrics, transcriptions, frames) and enforce via CI. The
include list will expand as modules are fixed.

.github/workflows/format.yaml

@@ -41,3 +41,7 @@ jobs:
       - name: Ruff linter (all rules)
         id: ruff-check
         run: uv run ruff check
+
+      - name: Type check (pyright)
+        id: pyright
+        run: uv run pyright