feat(plugin-mcp): add depth parameter support to all MCP find resource tools

[jhb-dev]

What

Adds depth parameter support to MCP resource tools (find and create), allowing MCP clients to control relationship population depth when querying or creating documents.

Why

MCP clients currently have no way to control how deeply relationships are populated when retrieving or creating documents. When collections have relationship fields, agents need the ability to either:

• Get just the IDs (depth=0) for lightweight responses
• Get fully populated relationship data (depth=1+) for richer context

This can significantly reduce the token count when reading documents.

How

• Added depth parameter to findResources and createResource schemas in schemas.ts
• Updated find.ts to pass depth to both payload.find() and payload.findByID() calls
• Updated create.ts to pass depth to payload.create() call
• Parameter is an optional integer (0-10) with default of 0
• Added integration tests

[jhb-dev]

Hi @kendelljoseph , thanks for the additional commits on this PR. Is there anything I can help with?

[kendelljoseph]

@jhb-dev I just merging changes from main right now and potentially fixed an additional issue with ID values.

So we're just needing CI to pass next.

[kendelljoseph]

I had to make a change to the schemas to support depth, but everything looks good now!

[github-actions]

🚀 This is included in version v3.72.0