chore: Document that agents must not reformat unrelated C# code

[hatayama]

Summary

• Add a short AGENTS.md rule forbidding unrelated C# reformatting and collapse-only rewrite scripts.
• Split out of chore: Remove unreferenced FirstPartyTools and Runtime PublicCandidates #2007 so PublicCandidate triage stays scoped and the agent-rule change has a clear history.

Context

During PR-5 triage, an agent rewrite collapsed multi-line call sites into one-liners and made the real deletion unreviewable. The durable fix is an explicit agent instruction (CLAUDE.md is a symlink to AGENTS.md).

Test plan

• Confirm the PR touches only AGENTS.md (+4 lines)
• Confirm wording matches the intended no-reformat / no-collapse-rewrite policy

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📥 Commits

Reviewing files that changed from the base of the PR and between e4adacb and 12fd521.

📒 Files selected for processing (1)

• AGENTS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/agent-formatting-rule

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[hatayama]

Closing per repository owner decision: do not add the AGENTS.md formatting rule.

Equivalent guidance already exists in global agent settings; adding a duplicate rule to AGENTS.md would dilute attention. The no-unrelated-reformat policy remains in force for triage work without an AGENTS.md change.