[PAIR-2]: Pair action structured response

[kevinkim-ogp]

TL;DR

Added structured response capabilities to the PAIR action, allowing users to define multiple output fields with specific data types.

What changed?

• Support two response formats: single field (existing) and multiple fields (new)
• Schema validation for response fields with proper constraints:
  • Field names must use only letters, numbers, underscores, and hyphens
  • Category fields require comma-separated category values
  • At least one field is required when using multiple fields format
• Utility functions to generate Zod schemas dynamically from field definitions

How to test?

1. Use the PAIR action and select "Separate fields" as the response format
2. Add multiple fields with different types:
   • Text fields for free-form text responses
   • Number fields for numeric values
   • Category fields with comma-separated options
3. Run the action and verify that the response is structured according to your field definitions
4. Try invalid configurations (empty field names, missing categories for category fields, field names that contain spaces or invalid characters) to test validation

[kevinkim-ogp]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• chore: expand ai test result #1325
• refactor: show warnings for AI responses #1316
• [PAIR-2]: Pair action structured response #1315 👈 (View in Graphite)
• [PAIR-1]: Pair action single response #1314
• [AI-ACTION-2]: Add tiptap-markdown to get markdown #1313 : 1 other dependent PR (#1324 )
• [AI-ACTION-1]: Refactor RTE to allow custom menu options #1312
• [AI-2]: Bump typescript and eslint deps #1301 : 1 other dependent PR (#1302 )
• [AI-1]: Install deps and bump zod #1300
• trunk/ai

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