fix(cli): avoid repeat compaction from stale totals

[catrielmuller]

Summary

• Use normalized token buckets, including reasoning tokens, for local auto-compaction threshold decisions.
• Fall back to provider-reported totals only when granular usage is unavailable, preserving recovery for providers that expose totals alone.
• Prevent an inconsistent provider total from causing an unnecessary immediate second compaction after context has already been reduced.

Closes #10888

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/avoid-repeat-compactions.md
• packages/opencode/src/kilocode/session/overflow.ts
• packages/opencode/src/session/overflow.ts
• packages/opencode/test/kilocode/session-overflow.test.ts

---

_{Reviewed by claude-4.6-sonnet-20260217 · 485,289 tokens}

_{Review guidance: REVIEW.md from base branch main}