docs(changelog): draft v7.0.0 release notes

[galbus]

Summary

Prepares the v7.0.0 release notes in readme.txt and adds tooling to make version bumps reliable.

The headline change is the new settings page and editor sidebar overhaul that simplifies plugin generation. The changelog is an early draft — a few remaining items can be added before release.

This PR also:

• moves the historic 6.x changelog entries out of readme.txt into changelog.txt, so readme.txt lists only the current release;
• bumps the version to 7.0.0-beta.1 (semver pre-release);
• adds scripts/bump-version.sh to set the version everywhere in one command.

Changelog (v7.0.0)

Every PR merged to main after the 6.3.0 release (#512) is treated as v7, following the existing format (linked PRs, concise descriptions, unlinked entries where there was no PR), organised into the standard categories:

• Enhancements — WordPress Plugin v7.0 Settings page & project-wide rewrite #520 (settings rewrite), v7 Block Editor & Classic Editor updates #527 (editor redesign), fix(S-8641) Wire the Player Embed setting & remove v6 settings-sync dead code #536, feat: opt-in "Customize" voice/language controls (s-8642) #537, Reorder voice picker to Language → Model → Voice #558, feat: reinstate term-gated Preselect Generate Audio #557, feat: live (disabled) player preview for the Add Player block #555, feat(editor): state-reflecting generation labels; rename Standard model to Legacy #563, v7: cache API reads + async audio generation on VIP #532
• Fixes — 15 fixes to the new v7 code, including fix(video): send full video_settings payload so videos generate #564 (video generation), fix(security): escape player onload to prevent stored XSS via Content ID #540 (stored XSS) and fix(security): add capability checks to bulk-edit AJAX handler #539 (capability checks) listed first
• Deprecations — removed post meta keys
• Compatibility — WordPress 7.0, PHP 8.5 (Add PHP 8.5 support #515)
• Codebase Enhancements — CI/test/dependency PRs (Plugin v7 - fix failing cypress tests #533, refactor: remove unused updatePostMeta util in inspect-panel #538, ci: re-enable Plugin Check on plugin-check-action v1.1.7 #562, ci(main.yml): cancel superseded runs via concurrency group #560, Remove environment from github workflows #516, Update GitHub Actions dependencies #517/chore(ci): upgrade github actions #535, chore: upgrade deps #514/Update wordpress/scripts #529/chore: upgrade deps #534); routine Dependabot bumps folded into one line

scripts/bump-version.sh

Bumping the version previously meant hand-editing five places (speechkit.php header + constant, package.json, package-lock.json, readme.txt stable tag), which drifts easily.

scripts/bump-version.sh 7.0.0-beta.1

• Validates the argument is semver; no-ops if already at that version.
• Edits the JSON files via node at exact paths, so no dependency's version is touched (a test bump changed only the 6 version lines).
• Re-reads and verifies all five locations, failing loudly if any didn't take.
• Does not commit, tag, or touch changelog headings — you review the diff and commit.

AGENTS.md is updated to mandate the script as the way to bump the version.

Notes for review

• The Fixes section lists bugs in v7 features that never shipped publicly. Listed per the "link all PRs" brief — happy to fold these into the feature entries or trim for a cleaner public changelog.
• fix(video): send full video_settings payload so videos generate #564 merges before this branch and is included in the changelog.
• Release date left as tbc.

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[gouravkhunger]

thanks! it'd be good to run the changelog/readme changes through @ptrko.