Drop the test timeout from the Dockerfile; date the changed documents

Time limits go only in the CI workflow, so the test phase runs
test/commit-upstream-policy-files.sh with no timeout. REPO_POLICIES.md
and both checklists change in this PR, so their last_modified is
2026-11-11.

Model: opus-5-5

Dockerfile

@@ -42,7 +42,7 @@ RUN script/bootstrap
 
 COPY . .
 
-RUN timeout 90 test/commit-upstream-policy-files.sh
+RUN test/commit-upstream-policy-files.sh
 
 # Development environment, and the last stage: a plain `docker build .`
 # names no target and so builds this one. Nothing is wanted from the two