fix(consistency): prevent post-commit hook re-entrancy loop

The post-commit hook re-invokes fix-consistency, which commits writeback
changes, which re-triggers the hook — causing exponential process spawning.

Fix: pass GIT_CUSTODIAN_SYNC=1 in the env for all writeback git commits.
Update the post-commit hook (not tracked by git) to exit early when this
variable is set.

Also remove the --no-verify flag that was added as a failed attempt (it
only skips pre-commit/commit-msg, not post-commit hooks).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/consistency_check.py

@@ -922,14 +922,18 @@ def _git_commit_writeback(
         f"Updated by fix-consistency on {_date.today().isoformat()}:\n"
         f"{summary}"
     )
+    import os as _os
+    # Pass GIT_CUSTODIAN_SYNC=1 so the post-commit hook can detect it is
+    # running from within a sync pass and exit early, preventing re-entrancy.
+    sync_env = {**_os.environ, "GIT_CUSTODIAN_SYNC": "1"}
     try:
         subprocess.run(
             ["git", "-C", repo_path, "add", str(file_path)],
-            check=True, capture_output=True,
+            check=True, capture_output=True, env=sync_env,
         )
         subprocess.run(
             ["git", "-C", repo_path, "commit", "-m", msg],
-            check=True, capture_output=True,
+            check=True, capture_output=True, env=sync_env,
         )
         return True
     except subprocess.CalledProcessError as e: