Add CHANGELOG for v2.0.0 rewrite

CHANGELOG.md

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+# Changelog
+
+## 2.0.0
+
+Ground-up rewrite addressing security, architecture, and feature gaps.
+
+### Security
+
+- Eliminated shell injection vulnerabilities — replaced `exec()` with `spawn()` using argument arrays and `shell: false`
+- Bundled Python wrapper scripts use `argparse` with no string interpolation of user input
+- Path traversal prevention in output folder, image directory, and image format handling
+- Prototype pollution protection in plugin arguments
+- Error messages sanitized to strip absolute paths before display
+
+### Added
+
+- **Image extraction** from PDFs and EPUBs — base64 data URIs decoded to `{filename}-images/` subfolder
+- **Plugin arguments editor** — key-value pair UI in settings for third-party Markitdown plugins
+- **Context menu** — right-click "Convert to Markdown" on supported file types in the file explorer
+- **Setup wizard** — guided modal for Python detection and Markitdown installation
+- **Batch progress bar** — visual progress indicator for folder conversions
+- **Python path fallback** — automatic `python3` detection on macOS/Linux when `python` is unavailable
+- **Live settings refresh** — changing Python path immediately re-checks dependencies
+
+### Changed
+
+- Decomposed monolithic `main.ts` (735 lines) into 12 focused modules under `src/` and `python/`
+- Unicode support via `PYTHONUTF8=1` environment variable
+- Async file I/O in modals (replaced `writeFileSync`/`unlinkSync` with `fs.promises`)
+- Updated build target to ES2020, TypeScript 5.x strict mode
+- Minimum Obsidian version remains 0.15.0
+
+### Removed
+
+- Docling converter (deferred to a separate plugin)
+- `child_process.exec()` — zero imports remaining in codebase
+
+## 1.0.1
+
+- Fix diacritics/Unicode support
+- UI text updates to follow Obsidian conventions
+
+## 1.0.0
+
+- Initial release
+- Convert files to Markdown using Microsoft's Markitdown
+- Support for PDF, DOCX, PPTX, XLSX, HTML, images, audio, and more
+- Single file and batch folder conversion
+- Azure Document Intelligence integration