overflow 检测与 compaction 重试补强，避免假性 200k/200k（PR #14102）

• You have logs showing context overflow variants (not always exact same error text).
• Load test or replay traffic is available for post-upgrade validation.

1. Collect baseline metrics: overflow errors, compaction retries, and session totalTokens behavior.
2. Upgrade to a build including PR #14102 and restart gateway.
3. Replay tool-heavy sessions to trigger long turns and potential compaction paths.
4. Confirm overflow variants now hit retry path and compaction-failure classification is applied consistently.
5. Check totalTokens no longer inflates from accumulated multi-call usage in one run.

• If provider errors are heavily rewritten by proxies, likely-overflow matching may still miss edge strings（需验证）。
• Compaction retry improves resilience but does not replace prompt-budget discipline for very large workflows.

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