docs(reflow): fact-check corrections and content fixes
- Remove inaccurate heading reconciliation example from how-it-works
- Remove Text Structure Agent from sub-agent list (not a real sub-agent)
- Fix extracted figures section: alt_text not yet populated, clarify fields
- Remove confidence score from change ledger docs (not implemented)
- Remove max_rounds from API docs (accepted but unused)
- Fix estimated_completion_minutes to 5 (was 3)
- Mark pipeline feedback endpoints as experimental/disabled in viewer
- Update WordPress plugin install to use GitHub Releases
- Add README index page for reflow docs
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>