Introduces CHANGELOG.md (Keep a Changelog style, Unreleased section) covering this
batch, with F8's breaking change — remote plaintext RPC now refused by default —
called out front and center along with the rpctls=1 / rpcallowplaintext=1 recovery
steps. Also records the Security / Fixed / Added entries for F1-F7. Updates the
tracking doc's status to reflect the completed release-notes + i18n back-fill and the
remaining pre-release items (F1/F2 manual repros, CJK subset-font rebuild).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
