docs: add CHANGELOG.md with full release history

Co-Authored-By: Rayner Zeng <1361209507@qq.com>

Author: ZengLiangYi

CHANGELOG.md

@@ -0,0 +1,60 @@
+# Changelog
+
+## [0.2.9] - 2026-04-09
+
+### Core: Summarization Engine Overhaul
+
+- **Structured output with Zod schema** — Replaced fragile `generateText()` + manual JSON parsing with `generateObject()` + Zod schema validation. LLM output is now guaranteed to match the expected structure, eliminating truncation and parse failures.
+- **Built-in retry on schema violation** — `generateObject()` with `maxRetries: 3` automatically feeds validation errors back to the model for self-correction, replacing the previous no-retry-on-parse-failure behavior.
+- **Output token limit** — Added `maxOutputTokens: 4096` to prevent mid-JSON truncation caused by low default token limits on some providers/models.
+- **System prompt rewrite** — New prompt guides the model to produce structured summaries covering decision context, implementation details, and reusable knowledge. Removed redundant JSON format instructions (now handled by schema).
+- **Language-following summaries** — Summaries now match the conversation's language (Chinese conversations get Chinese summaries, English get English) instead of being hardcoded to Chinese.
+- **Truncation-aware** — Prompt explicitly instructs the model to summarize based on visible content only when conversations are truncated, rather than guessing omitted parts.
+- **Deleted legacy code** — Removed `extractJSON()` and `validateResult()` functions (~50 lines of brittle parsing logic).
+
+### Core: Search Quality Improvements
+
+- **Search result text preview** — `semanticSearch()` now returns actual `chunkText` from the embeddings table instead of hardcoded empty strings, enabling meaningful result previews.
+- **Richer embeddings** — Embedding text now includes tags and code snippet descriptions in addition to title, summary, and conclusions, improving keyword matching and semantic relevance.
+- **Cleaned up dynamic imports** — Replaced redundant dynamic `import()` calls in the search expand-relations path with top-level imports.
+
+### Dependencies
+
+- Added `zod` as a direct dependency (previously only a transitive dependency via `ai` SDK).
+
+### Landing Page & Site
+
+- Full landing page with Astro 6 + React islands + Tailwind CSS v4 + Framer Motion.
+- Bilingual i18n (EN `/`, ZH `/zh/`).
+- 7 sections: Hero, IntegrationStrip, HowItWorks, FeatureBento, LocalFirst, CliShowcase, Footer.
+- GitHub Pages deployment via GitHub Actions.
+- Replaced all emoji icons with proper SVG brand icons (Anthropic, Cursor, OpenAI from SimpleIcons).
+- Design audit and full redesign pass.
+
+### Promo Animations (Remotion)
+
+- 5 new landing page compositions: hero, feature-search, feature-mcp, feature-cli, cli-showcase.
+- macOS window style (Variant B), 800x450 @ 30fps.
+- TransitionSeries for CLI segment transitions.
+- Batch render script (`promo/render-landing.sh`).
+
+### CI/CD
+
+- Upgraded all GitHub Actions to Node 24 compatible versions.
+- Reverted `setup-node` to v4 (v5 does not exist).
+
+### Docs
+
+- Added website badge to README.
+
+## [0.2.8] - 2026-04-08
+
+- Interactive TUI for CLI (`crystal` commands with Ink 7).
+- Codex CLI and Cursor data source adapters.
+- File watcher for auto-import from all three data sources.
+
+## [0.2.7] - 2026-04-08
+
+- Electron desktop app with system tray, single-instance lock, window state persistence.
+- CSP security policy, graceful shutdown, sandbox mode.
+- NSIS installer packaging.