docs: fix notices template claim and close generator omission paths

The template still described the removed doc-sync gate; it now states the
pre-commit + test-lane mechanism that actually runs. Read the nested
native/landlock-run/packages manifests, accept PEP 508 requirements with
no version or with a marker, and reject a vendor/README.md table that
stops covering a vendored directory instead of dropping it silently.
Extend the pre-commit glob to the generator and the build-time pin
source; record the deletion trigger gap the test lane backstops.

lefthook.yml

@@ -19,9 +19,13 @@ pre-commit:
       stage_fixed: true
 
     # Regenerate rather than reject: a dependency edit that forgot the notices
-    # would otherwise fail the test lane long after the commit.
+    # would otherwise fail the test lane long after the commit. The glob matches
+    # every input the generator reads, including the generator itself and the
+    # build-time pin source. Deleting a manifest cannot trigger this job —
+    # lefthook only inspects files present on disk — so that one case still
+    # falls through to the freshness assertion in the test lane.
     - name: third-party notices (staged)
-      glob: '{package.json,*/package.json,*/*/package.json,*/*/*/package.json,pnpm-workspace.yaml,pnpm-lock.yaml,vendor/README.md,python/*/pyproject.toml}'
+      glob: '{package.json,*/package.json,*/*/package.json,*/*/*/package.json,pnpm-workspace.yaml,pnpm-lock.yaml,vendor/README.md,python/*/pyproject.toml,scripts/gen-third-party-notices.ts,scripts/build-exe-for-python-sdk.ts}'
       run: node_modules/.bin/tsx scripts/gen-third-party-notices.ts && git add THIRD_PARTY_NOTICES.md
 
     - name: whitespace (staged)