The file shipped in #277 but was never added to the manifest, so forks
got no signal when it changed. Surfaced during #282 review.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The per-file 'git show' failure was swallowed with a bare continue, so a file renamed or deleted upstream (or any unexpected git error) ended with a clean '[OK] All framework files are up to date' - a false all-clear.
Now the two failure modes are distinguished: files present locally but missing from the upstream ref are listed explicitly with a final [WARNING] instead of [OK], and unexpected git errors are added to the configuration errors with their stderr.
Adds UpstreamRefMissingFileTests, which simulates upstream dropping AGENTS.md while the fork keeps its copy: it fails on master and passes with the fix.
GitHub serves repo paths case-insensitively, so a direct clone from https://github.com/madslorentzen/ai-job-search (lowercased) triggered the fork-vs-self warning even though origin is the template repo itself. Lowercase both sides of the check.
New test clones with a lowercased URL: fails on the previous check, passes with this fix.
On a fork without an 'upstream' remote, the checker silently fell back to 'origin' (the fork itself) and still printed '[OK] All framework files are up to date with upstream!', a false positive: the fork is always up to date with itself, so upstream updates were never reported. This is exactly the setup CONTRIBUTING.md recommends for forks.
Now, when the fallback remote does not point at the ai-job-search template repo, the script warns that the comparison is fork-vs-self and prints the command to add the template as a remote. The final OK line now names the ref it actually compared against.
Tests (new tests/test_check_upstream_updates.py, three scenarios) fail on master and pass with the fix.
