fix(server): stop querying Claude context usage after turns

[t3dotgg]

Claude queried detailed context usage after every completed turn. If native token counting failed, that query could trigger extra model requests.

This change stops the automatic detailed query. Completion now uses the final main assistant usage when available, keeps cumulative result usage as processed tokens, and falls back to the existing result, iteration, and stream snapshots.

Focused Claude adapter tests verify usage, cumulative totals, turn completion, and zero detailed context queries.

Tradeoff: the context meter omits its automatic compaction note because normal SDK messages do not expose the effective policy. Claude Code's automatic compaction behavior is unchanged.

Refs #7338

Built by GPT-5.6 Sol in the Codex harness.

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Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.3 KiB	13.3 KiB	−9 B (−0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	6.9 KiB	6.9 KiB	−6 B (−0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.4 KiB	6.4 KiB	−3 B (−0.0%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	55.6 KiB	55.6 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	11	11	0 (0.0%)	21	✅
Claude	Total thread wire	13.3 KiB	13.3 KiB	+24 B (+0.2%)	15.1 KiB	✅
Claude	Thread snapshot wire	6.9 KiB	6.9 KiB	−4 B (−0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.4 KiB	6.5 KiB	+28 B (+0.4%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	56.4 KiB	56.4 KiB	+44 B (+0.1%)	66.4 KiB	✅
Claude	Live turn messages	10	11	+1 (+10.0%)	21	✅

Baseline: 702a6ad · PR result: 73916c2 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 109.4 KiB
• Claude decoded thread snapshot: 110.1 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Would Approve

Macroscope's review found this PR approvable — This is a localized Claude adapter bug fix that removes unintended context-usage queries and adds targeted usage/compaction coverage without changing schemas, defaults, deployment, or sensitive paths. A separate unresolved Medium finding flags lost automatic-compaction metadata, leaving a correctness risk recorded for follow-up.

Not approved because:

• 1 blocking correctness issue found at or above your repo's Minimum Blocking Severity

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