[raiseCatError]

Press-kit PR #127 rebuilt three apps and booted an iPhone Duo simulator. The Tests classifier only recognised top-level and docs/ Markdown. This PR extends the existing classifier rather than adding a parallel system.

What changes

• The rules move from inline Python in tests.yml to scripts/ci/classify_pr_paths.py, with 23 unit tests in scripts/ci/test_classify_pr_paths.py. The tests run in release-tooling.
• The changes job runs the base branch's copy of the classifier (git show HEAD^1:…), so a PR can't reclassify itself by editing it. When the base has no classifier, as on this PR, the job falls back to full CI.
• git diff --no-renames lists both sides of a rename, so a Swift file can't be "renamed" into a Markdown file to skip CI.
• New non-code paths:
  • press-kit/**, tools/press-kit/** and assets/press-kit-preview.png
  • assets/readme/* images, which no build references
  • Markdown in docs/, handoff-2.0/, launch/ and ux-review/, plus Markdown directly in fastlane/ and AndroidReceiver/
  • top-level Markdown, as before
  • .gitignore, only when every added or removed line is blank, a comment, or a press.html/press-kit…/docs… entry
• The upstream listing-ID guard, which AppStoreTests enforces, now scans every changed file. A match still forces the Mac job.
• New non-required press-kit job (Ubuntu, about a minute). build.py verifies every asset against the reviewed SHA-256 inventory and rebuilds the page, previews and ZIPs, and README/preview images must decode. It runs for press-kit PRs, on every push, and whenever classification fails.

Jobs per PR type

PR changes	changes	release-tooling	mac	android	ios-duo	press-kit	conventional
Docs / README images only	runs	skipped (passes)	skipped (passes)	skipped (passes)	skipped	skipped	runs
Press kit (± docs, safe .gitignore)	runs	skipped (passes)	skipped (passes)	skipped (passes)	skipped	runs	runs
pr-title.yml only	runs	runs	skipped	skipped	skipped	skipped	runs
Any app code, shared protocol, project/dependency config, scripts, workflows (incl. tests.yml and the classifier), unknown path, or mixed	runs	runs	runs	runs	runs	runs if press-kit touched	runs
Push to main/dev/release/**	runs	runs	runs	runs	runs	runs	n/a

Required check names (mac, android, release-tooling, conventional) are unchanged. A skipped job reports success, so docs-only PRs aren't left pending. Fail closed: if changes fails, every job runs.

Verified locally

• 23 classifier unit tests pass.
• check-release-workflows.rb passes.
• An end-to-end simulation of the classify step from tests.yml in a scratch git repo (base commit plus --no-ff merge) gave the expected result for 8 cases: docs-only, press-kit, mixed, code renamed to .md, a tests.yml change, an unsafe .gitignore change, a PR that rewrites the classifier to skip everything (full CI), and a push.
• The image-decode step passes against the press-kit tree (11 images).

This PR changes tests.yml and has no base classifier, so it runs full CI itself.