fix(daemon): restore Codex usage synchronization

[AnnatarHe]

Summary

• parse the current Codex additional_rate_limits array while retaining legacy map compatibility
• send the ChatGPT account header and synchronize v2 dynamic windows, names, and credits
• document quota polling separately from OTEL telemetry and remove the hardcoded five-hour assumption

Why

Usage synchronization stopped matching the live WHAM response shape. The response is now an array of named limits, can omit windows, and returns credits separately; account-scoped requests also need the account ID header.

Impact

The daemon performs an immediate poll and then polls every ten minutes, forwarding exactly the windows and credit state returned by Codex. No five-hour window is synthesized.

Rollout

1. Server contract and persistence: https://github.com/shelltime/server/pull/457
2. CLI collection and synchronization (this PR)
3. Web rendering: https://github.com/shelltime/web/pull/576

Validation

• focused Codex rate-limit and synchronization tests pass
• git diff --check passes

The full command suite still has pre-existing home-isolation failures. The installed Go toolchain lacks covdata, and go vet retains an existing context.WithTimeout cancellation warning in cmd/cli/main.go.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[codecov]

Codecov Report

❌ Patch coverage is 86.04651% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
daemon/codex_ratelimit.go	84.21%	7 Missing and 5 partials ⚠️

Flag	Coverage Δ
unittests	79.38% <86.04%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
daemon/codex_usage_sync.go	95.34% <100.00%> (+0.34%)	⬆️
daemon/codex_ratelimit.go	81.97% <84.21%> (+25.52%)	⬆️

... and 1 file with indirect coverage changes

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[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.