Classify pull requests by size, kind, and area

[Michelle Clayton (michelle-clayton-work)]

Summary

• call the reusable go-infra classifier for deterministic size:* and repository-specific area:* labels
• run the reusable agentic kind classifier afterward to maintain every applicable kind:* label
• classify PRs when opened, synchronized, reopened, or marked ready for review
• support manual single-PR classification and deterministic size/area backfill
• keep both stages API-only for fork safety

The area mapping covers Agent Framework's agent, workflow, message, tool, provider, internal, tooling, examples, and GitHub automation surfaces, including provider-specific labels.

Ordering

The size/area job runs first and provisions every allowed kind label. The agentic job then analyzes the PR diff and safely adds all applicable kinds while removing only stale kind labels.

Closes #767

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[George Adams (gdams)]

Michelle Clayton (@michelle-clayton-work) the CI workflow isn't triggering. I'm not sure why?