Fix: add missing parser/docgen, rename parser→go_parser, add uv packaging

- parser.py renamed to go_parser.py (avoids Python builtin conflict)
- docgen.py was missing from flat structure
- Added pyproject.toml for uv
- Updated .mcp.json to use uv run
- Updated README for uv workflow

ingest.py

@@ -6,7 +6,7 @@ import time
 import json
 from pathlib import Path
 
-from parser import parse_go_file, filter_imports, get_repo_module, resolve_import_to_file
+from go_parser import parse_go_file, filter_imports, get_repo_module, resolve_import_to_file
 from docgen import generate_file_doc, generate_repo_doc, generate_docs_batch
 from db import GraphDB