feat: run the CI checks in a pre-push hook

AGENTS.md

@@ -410,6 +410,7 @@ fails loudly.
    extend one that already covers it. Use synthetic fixtures where possible, and
    the slow whisper tests only when testing whisper behavior.
 6. Run `make lint`, `make typecheck` and `make test` before declaring done.
+   `lefthook install` runs `make lint typecheck test-fast` before every push (`lefthook.yml`).
 
 ## Common Pitfalls
 

docs/README.md

@@ -136,6 +136,7 @@ make check-sample                       # Transcribe the 4-speaker AMI sample; p
 make lint                               # ruff check and format check
 make format                             # ruff format
 make typecheck                          # mypy --strict
+lefthook install                        # Run lint, typecheck and test-fast before every push
 make clean-output                       # Delete every session's outputs under tmp/output
 ```
 

lefthook.yml

@@ -0,0 +1,6 @@
+# Runs what CI runs, minus the package build. Install once per clone: `lefthook install`.
+pre-push:
+  jobs:
+    - name: check
+      # Git's repo variables break tools run from a linked worktree.
+      run: unset $(git rev-parse --local-env-vars); make lint typecheck test-fast