Add OpenCode Go (Lite) provider

[velazcod]

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: a64ba1932d

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[chatgpt-codex-connector]

Accept resetAt timestamps without fractional seconds

This parser only configures ISO8601DateFormatter with .withFractionalSeconds, so common RFC3339 values like 2026-03-05T14:22:00Z fail to parse. In that case parseWindow falls back to resetInSec ?? 0, which makes the usage windows look like they reset immediately even though the API returned a valid reset time. Supporting both fractional and non-fractional ISO8601 forms avoids incorrect reset displays.

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[ratulsarna]

@velazcod can you address this please?

[ratulsarna]

Thanks for the PR @velazcod !

A couple comments apart from the one codex pointed out:

1. Worth double-checking the fallback behavior in parseWindow: on resetAt parse failure, defaulting to 0 is pretty risky because it silently produces incorrect reset UI instead of surfacing bad data.
2. Because this PR adds 3-window usage fetching, one timestamp parsing issue can break rolling/weekly/monthly reset displays at the same time. I’d add tests covering all three windows with both ...00Z and ...00.123Z formats.

[velazcod]

Yeah all good points. TAL