docs: rewrite README for accuracy and readability

The README taught the coordinate-first interaction model that the harness
replaced with stable [eN] refs, and documented 22 of the 38 registered
tools. Restructured so each section answers one question, and rewrote the
content against the actual tool registry.

- Teach the ref-first model: snapshot yields [eN] handles that re-resolve
  at action time, with coordinates as the fallback rather than the default.
- Document the 16 missing tools: the forms path (fill/select_option/focus),
  console, wait_for, dispatch_key, drag_and_drop, upload_file, download,
  print_to_pdf, viewport_resize, close_tab, and setup.
- Rebuild the comparison table as prose cells grouped by dimension. Drops
  the unverifiable "unknown" rows and the duplicated click/dispatch claims,
  and adds a provenance line so competitor claims stay correctable.
- Remove stale guidance: /browser-reload-daemon as the fix for a Chrome
  restart (auto-reconnect landed in 0.6.0), and the unbenchmarked "10-50x
  faster" claim on http_get.
- Add sections for concurrency and tab isolation, flags and environment
  variables (BU_CDP_WS, BU_CDP_PORTS, BH_SCRIPT_DIR), and a troubleshooting
  table keyed to the errors the harness actually emits.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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