v0.2.1

fix: re-extract seen posts after a prompt version bump

The poll skipped every post whose modified timestamp was already seen, so a
new PROMPT_VERSION only took effect for new or edited posts (or with
--reextract). A seen post is now skipped only when the service also holds
cached spans for its PDF under the current prompt version.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UsbTfysTyvDquAUwNh99Dj