MCP: add a read-only `get_my_week` summary tool (with its contract test)

[ali-maher-m]

What

Add a small read-only MCP tool, get_my_week, that returns the signed-in user's week summary (items + time logged). Keep it read-only. RyTask enforces 100% MCP parity, so it must be declared and tested.

Where

• Registry: packages/contracts/src/mcp/registry.ts.
• Tools/dispatch: apps/api/src/mcp/.
• Declare it + its required test in the owning module's module.testplan.ts.

How to verify

pnpm check:mcp-parity stays green and the new tool's contract test passes.

Notes

This is a great way to learn the MCP layer — happy to point you at an existing read-only tool to copy from.