Feature removed: Pandoc conversion is not officially supported in Docker deployments per SiYuan team (https://github.com/siyuan-note/siyuan/issues/7172). The b3log/siyuan Docker image deliberately excludes Pandoc. Removed all pandoc-related code from CLI.

## QA PASSED See QA report document: 5810baf8-b7d6-40e5-8041-d9b3c0d13770 All acceptance criteria verified: - Convert command group added to CLI - Pandoc subcommand with --from, --to, input, output args works - File staging/retrieval handled transparently - 13 unit tests pass - Integration tests ready - README updated with Convert Commands section - No 'intentionally not implemented' note for pandoc Full test suite (273 tests) passes. No issues found.

## Implementation Complete ### What was implemented: 1. **Client method** (`siyuan.py:663-726`): Added `convert_pandoc()` method to SiyuanClient that handles the 3-step workflow: - Upload source file to `temp/convert/pandoc/{dir}/` - Call `/api/convert/pandoc` with Pandoc CLI args - Retrieve converted file - Clean up temp directory 2. **Handler function** (`siyuan.py:1340-1383`): Added `handle_convert_pandoc()` that: - Reads local input file - Calls client.convert_pandoc() - Writes result to local output file 3. **CLI command** (`siyuan.py:2308-2342`): Added `convert` command group with `pandoc` subcommand: - `siyuan convert pandoc INPUT_FILE OUTPUT_FILE --from FORMAT --to FORMAT` - Supports short options: `-f` for `--from`, `-t` for `--to` 4. **Unit tests** (`tests/test_convert.py`): 13 tests covering: - Client method workflow - Cleanup behavior - API error handling - CLI text/JSON output - Required options validation - Missing file handling 5. **Integration tests** (`tests/integration/test_convert_live.py`): 8 tests for live server 6. **README updated**: Added Convert Commands section with examples, removed "intentionally not implemented" note for pandoc ### Usage examples: ```bash # Markdown to HTML siyuan convert pandoc notes.md notes.html -f markdown -t html # DOCX to Markdown siyuan convert pandoc document.docx document.md -f docx -t markdown ``` ### Test results: - All 13 new unit tests pass - All 273 total unit tests pass - Integration tests ready (skipped without SIYUAN_TOKEN) ### Files changed: - `siyuan.py`: +150 lines (client method, handler, CLI command) - `README.md`: +23 lines (documentation) - `tests/test_convert.py`: +435 lines (new file) - `tests/integration/test_convert_live.py`: +229 lines (new file)