fix(grok): account for metered preflight failures

[luvs01]

Motivation

• Grok/Devin can emit usage frames before returning an HTTP 429; the new preflight early-return path returned a refusal without recording that usage, breaking durable spend accounting and allowing billed tokens to escape a configured ceiling.

Description

• Record usage carried on a Devin preflight error before returning the HTTP 429 by calling transportState.bindKeyUsageFromBridge(preflight.error.usage) in the Grok preflight refusal path in src/server/responses/run-turn-execution.ts.
• Add a regression test tests/responses/responses-grok-devin-preflight.test.ts that verifies metered usage attached to a pre-output 429 is preserved for both streaming and buffered response modes.
• Update documentation in structure/transports/responses-spend.md to clarify that pre-output Grok/Devin 429 errors bind terminal usage the same way streaming/buffered bridges do.

Testing

• Ran the focused regression file with Bun: npx --yes bun@latest test tests/responses/responses-grok-devin-preflight.test.ts, which passed (25 tests passed).
• Typecheck: npx --yes bun@latest run typecheck succeeded.
• Structure checks: npx --yes bun@latest run structure:check succeeded.
• Privacy scan: npx --yes bun@latest run privacy:scan succeeded.
• Note: bun run test:changed could not run in this checkout because no dev comparison ref was available; focused regression coverage was executed instead.

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✅ Deterministic PR hygiene checks passed.

[luvs01]

이관됨: lidge-jun#6035

[luvs01]

동일 수정이 상류 저장소에 제출되어 이 포크 PR의 목적은 달성됐습니다.