v0.4.5

MT309203 accesskey-label consistency check — catches the exact
pattern MODA reviewers flag: the sitemap page's accesskey description
table says one thing but the actual element aria-label / title /
hidden text says something else. Screen reader users read the table
first, then press the shortcut and hear different text — confusing.

Changed

• MT309203 now cross-checks the accesskey description table
  against same-page [accesskey] elements' aria-label / title /
  visible text. Mismatches → fail with per-key diff listing
  (table description vs actual screen-reader announcement).
  Previously MT309203 only verified the table and Firefox note
  existed; text consistency was unchecked.

Notes

• Driven by a real MODA AAA round-3 finding on light-design.com.tw:
  reviewer flagged GN1240500E because aria-label="開啟選單" did not
  match the sitemap table's "開啟頁首主選單 (含各頁面連結)".
• Cross-check is limited to the sitemap page itself (single-page
  rule). Cross-page label-vs-table comparison (e.g. checking every
  page's accesskey elements against the sitemap table) would require
  architectural support for cross-page state passing — deferred.
• Rule count unchanged at 133.