Add a new top-level mcp/ Go module that will host the Claude Desktop MCPB
server. U1 of the Claude Desktop .mcpb bundle plan: scaffold only, no
behavior yet.
- mcp/go.mod targets Go 1.22+ with mark3labs/mcp-go as the planned
dependency (added in U3 when the server wiring lands).
- mcp/scripts/sync-engine.sh mirrors skills/last30days/scripts/ into
mcp/vendored/ before each build, keeping the Code skill and Desktop
bundle on the same engine source.
- Root .gitignore excludes mcp/vendored/ and mcp/build/ so the engine
mirror and cross-compiled binaries stay local.