docs(changelog): backfill 0.0.23 → 0.0.27 entries

[blove]

Summary

Backfill missing CHANGELOG entries for the gap between 0.0.22 and 0.0.28. Each entry sourced from the corresponding PR body and commit message — no code changes.

Version	PR	Headline
0.0.23	#196	Public-API exports: extractCitations, bridgeCitationsState
0.0.24	#197	Markdown table rendering + 3 citation/task bugs
0.0.25	#198	A11y polish: textarea auto-resize, Escape, aria-pressed
0.0.26	#199	Agent.regenerate(index) added; partial-markdown 0.3 peer
0.0.27	#200	Server-side rollback via RemoveMessage + updateState; drop fast-json-patch

Test plan

• No code changed; renders cleanly as Markdown
• CI passes (no-op for tests)

🤖 Generated with Claude Code

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