fix(openai): honor OpenCode Go usage reset durations

[william-drakemond]

Summary

• Recognize OpenCode Go GoUsageLimitError responses as account usage limits.
• Parse reset durations from messages such as Resets in 2 days and composite values such as Resets in 4hr 59min.
• Keep the existing 429 fallback behavior for malformed payloads and unrelated error types.

Problem

OpenCode Go usage-limit responses do not provide the reset through the OpenAI fields already handled by sub2api, such as resets_at or resets_in_seconds. The parser therefore returned no reset time. API-key accounts then fell through to the configured 429 cooldown, which defaults to 5 seconds, became schedulable again, and repeatedly hit the same exhausted account before its quota actually reset.

OpenCode rolling-window messages can contain more than one duration component. Parsing only the first component would turn 4hr 59min into 4h and release the account up to 59 minutes too early.

Fix

parseOpenAIRateLimitResetTime now recognizes GoUsageLimitError and, only for that error type, parses the reset duration from its human-readable message.

The duration parser:

• Requires the Resets in marker.
• Supports seconds, minutes, hours, days, and weeks, including common abbreviations.
• Accumulates contiguous components such as 4hr 59min.
• Rejects non-positive, malformed, and overflowing values so the established fallback remains in control.

The computed timestamp flows through the existing 429 path. That path persists the rate limit with SetRateLimited and notifies the runtime blocker, so API-key accounts stay out of scheduling until the parsed reset time. Unknown error types continue to return no parsed reset.

Tests

Added coverage for:

• Day and hour reset messages.
• Composite hour/minute reset messages.
• Rejection of unrelated error types.
• The full API-key 429 path, including persistence and runtime blocking.

Validated with:

• go test -tags=unit ./internal/service -count=1
• go test -tags=integration ./...
• golangci-lint v2.9.0 run ./internal/service --timeout=10m (0 issues)

[github-actions]

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[william-drakemond]

I have read the CLA Document and I hereby sign the CLA