chore(server): unexport OpenCode capabilities left unused by test removal

[juliusmarminge]

The Check job fails on every PR against t3code/codex-turn-mapping. Its first step, vp run knip:check, reports Unused exports (1): OpenCodeProviderCapabilitiesV2 apps/server/src/orchestration-v2/Adapters/OpenCodeAdapterV2.ts:149. #13459 removed the last test that imported that constant, and nothing outside OpenCodeAdapterV2.ts uses it now. Because knip fails first, the job stops before vp check and typecheck run, which hides any real failures from those steps.

Change

Drop export from OpenCodeProviderCapabilitiesV2. The constant is still used in the same file (getCapabilities and the session capabilities).

Verification

• vp run knip:check on base tip 52c336a before the change: fails with the unused export above.
• vp run knip:check after the change: exits 0 with no findings.
• vp exec tsc --noEmit -p . in apps/server: exits 0, no error TS or warning TS lines.
• vp lint and vp fmt --check on OpenCodeAdapterV2.ts: formatted. The one lint warning (an unused layer) was already there and is unrelated.
• Not run: tests. The change only removes an export, and nothing imports the constant.

Model: Claude Opus 5.5 (Claude Code)

🤖 Generated with Claude Code

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[macroscopeapp]

Approvability

Verdict: Approved at 8c1dcde

Macroscope's review found this PR approvable — This is a one-line internal export cleanup; the capability object remains used by the adapter, with no change to runtime behavior, defaults, or production workflows. Repository searches found no remaining external consumers of the removed export.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	4.9 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.7 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.1 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.4 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	1	—	8	✅
Claude	Total thread wire	—	4.9 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.7 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	20.8 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 8c1dcde · 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: 106.1 KiB
• Claude decoded thread snapshot: 106.4 KiB

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