docs: Document special Dataverse type formats in MCP data operation tool descriptions

[TomProkop]

Problem

The record_create, bulk_create, record_update, and bulk_upsert MCP tool descriptions don't explain how to format special Dataverse column types in the JSON data parameter.

During the demo session, we had to discover by trial-and-error that:

• OptionSet: pass as integer 375970000 (auto-wrapped since PR fix: metadata-aware data ops, OptionSet surface, recovery hints, MCP logging #35)
• Lookup: pass GUID string "37bb09bf-e042-f111-88b4-000d3ab2633b" (auto-wrapped since PR fix: metadata-aware data ops, OptionSet surface, recovery hints, MCP logging #35)
• Label-based values: NOT yet supported (tracked in feat: OptionSet label-based values in data operations (resolve "Box" → 375970000) #47)

Proposal

Add format examples to the tool parameter descriptions:

OptionSet:   {"udpp_packagetype": 375970000}
Lookup:      {"udpp_itemid": "37bb09bf-..."}
Money:       {"revenue": 1500.50}
Boolean:     {"udpp_isdiscontinued": true}
DateTime:    {"udpp_lastreceived": "2026-05-01T00:00:00Z"}

Priority: LOW — helpful for AI agents and developers using MCP tools