test(server): accept either valid native file-search match

[rynfar]

The file-filter regression test assumed one fixed ranking between two equally valid native search results. Accept either matching file while retaining the one-result, file-kind, and truncation assertions.

Adopts pingdotgg/t3code#9720 (8ccb933a8aae461b616b199ab287164c3311a755). All 30 WorkspaceEntries tests and scoped lint pass. Production behavior is unchanged.

Model: GPT-6 Astra. Harness: Codex.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.8 KiB	13.7 KiB	−156 B (−1.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	+5 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.7 KiB	6.6 KiB	−161 B (−2.3%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	57.4 KiB	56.5 KiB	−910 B (−1.5%)	66.4 KiB	✅
Codex	Live turn messages	10	8	−2 (−20.0%)	21	✅
Claude	Total thread wire	13.8 KiB	13.8 KiB	+12 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	+2 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.7 KiB	6.7 KiB	+10 B (+0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	58.2 KiB	58.2 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: 01e635a · PR result: 32be657 · 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: 111.2 KiB
• Claude decoded thread snapshot: 111.9 KiB

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