feat(search_projects): add parent_uid filter to return child projects

[emsearcy]

Summary

Adds an optional parent_uid parameter to the search_projects tool so callers can retrieve child projects scoped to a specific parent foundation or umbrella project UID.

Changes

• SearchProjectsArgs gains a new optional parent_uid field with a descriptive jsonschema tag.
• When parent_uid is provided, the query payload Parent field is set to "project:<parent_uid>" — mirroring the existing pattern used by search_committees and search_committee_members.
• The name field is now omitempty so callers can filter by parent alone without supplying a name.
• The tool description is updated to mention the parent filter.
• The info log line includes parent_uid alongside name and page_size.

Jira

ARCH-364

[claude]

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[Copilot]

Pull request overview

Adds support for scoping search_projects results to a parent project, enabling callers to retrieve child projects under a specific foundation/umbrella UID.

Changes:

• Extends SearchProjectsArgs with optional parent_uid and makes name optional (omitempty).
• Sets the query payload Parent field to project:<parent_uid> when provided.
• Updates the tool description and logging to include parent_uid.

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[Copilot]

With name now omitempty and parent_uid optional, callers can omit both fields and this handler will issue an effectively unfiltered QueryResources request (Type=project, Sort=name_asc). If the tool is intended to require at least one filter (name or parent), add an explicit validation error when both are empty, or update the tool description/jsonschema text to clearly document that an unfiltered listing is allowed.

[emsearcy]

not worried about this at the moment