feat(mcp): serve safe source file assets
Add a stdio MCP server for searching and reading safe engineering source files from the wiki file asset index.
The implementation uses registry-backed ACL checks, engineering-file whitelisting, asset:// resource URIs, read-only SQLite access, CLI entrypoints, optional MCP packaging, and unittest coverage for search, metadata, resource reads, blocked sources, bot ACLs, and size limits.
Validation: python3 -m unittest discover -v; python3 -m py_compile obsidian_wiki/config.py obsidian_wiki/file_assets.py obsidian_wiki/mcp_assets.py obsidian_wiki/mcp_server.py obsidian_wiki/cli.py tests/test_mcp_assets.py; real BJD vault search/read smoke tests.
nac
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