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ci: auto-purge camo cache so README badges refresh on release

GitHub serves images embedded in the README through its Camo image
proxy (camo.githubusercontent.com), which caches each upstream URL
with a ~24h TTL. After v1.0.17 shipped, the PyPI version badge in
the README kept showing an older release until Camo's own TTL
expired — even though shields.io itself was already serving the
correct value.

This workflow PURGEs every camo URL referenced from the rendered
README so the new release / coverage values appear immediately.

Triggers:
  - every push to main (in case the README itself changed)
  - every v* tag (so PyPI/AUR version badges flip on release)
  - manual workflow_dispatch for ad-hoc refresh

Implementation:
  - Sleeps 60s on tag push so shields.io/PyPI and coveralls.io have
    time to register the new release before we re-prime the cache.
  - Fetches the rendered README HTML via the GitHub API (rewrites
    <img> srcs to camo.githubusercontent.com URLs).
  - Extracts each unique camo URL, sends PURGE.
  - Reports any non-200 responses as a workflow warning rather than
    a hard failure (so a transient camo outage doesn't fail the
    release pipeline).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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