humanspeak / svelte-virtual-chat

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docs: accessibility guide with live keyboard demo + README sweep (#52)

* docs: document accessibility — keyboard navigation, screen readers, reduced motion

The keyboard/a11y feature (#36) shipped with no discoverable
documentation: the README had zero accessibility mentions and the docs
site only carried the viewportLabel prop row.

- New Accessibility guide (/docs/guides/accessibility): the labeled
  focusable region, the full keyboard map and its follow-bottom
  semantics, descendant-interaction preservation, reduced-motion
  behavior, respected programmatic scrolling, and the two app-level
  patterns the component deliberately leaves to consumers — aria-live
  announcements for virtualized messages, and pairing
  onFollowBottomChange with a visible jump-to-newest control.
- README: Accessibility section, keyboard/reduced-motion feature
  bullets, and the missing viewportLabel prop row.
- README: descriptive alt text on the TokenMaxing badge.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs(readme): full accuracy sweep; drop dead debug prop and unused esm-env dep

README sweep — every claim checked against the current code:

- New "Documentation & Live Examples" section: guide links plus a table
  of the four interactive demos on virtualchat.svelte.page, which the
  README never mentioned.
- Removed the test-count bullet (test counts don't belong in a README
  and it was stale), the `debug` prop row (the prop was accepted but
  never read — also removed from types.ts), and the esm-env caveat on
  the zero-dependencies bullet (the dep was never imported — removed
  from package.json, so the claim is now simply true; publint passes).
- Corrected stale mechanics: measurement is layout-offset-derived with
  ResizeObserver as the trigger (margins counted), follow-bottom
  corrections land pre-paint in the same frame as growth, and streaming
  updates coalesce one reactive cascade per frame.
- Added the missing heightCacheVersion row to t... (continued)

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