T16-01 Add canonical Zod MCP inputs and generated schemas #474

Deliverable

Replace reusable/raw MCP input shapes with named strict Zod object schemas, add safe bounded pagination preprocessing, export generated JSON Schema, and cover coercion, required fields, unknown fields, descriptions, defaults, and bounds.

Acceptance

All local and hosted quality/security checks pass; all PR comments are considered; merge and cleanup receipts are recorded.