style(agent-core-v2): fold retry-budget note into the file header

[sailist]

Related Issue

Follow-up to #1740 (Codex review comment).

Problem

The retry-budget comment added in #1740 sits beside an exported constant in packages/agent-core-v2/src/_base/utils/retry.ts, but packages/agent-core-v2/AGENTS.md requires comments to live only in the top-of-file /** */ block, never beside functions, methods, or statements. #1740 was merged before this fix could be pushed.

What changed

Fold the default-budget rationale into the file header and remove the standalone comment. Comment-only change; no behavior difference, no changeset needed.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works. (N/A — comment-only change)
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 37596d9

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commit: 37596d9