First in-tree consumer of ProviderProfile.fetch_account_usage: the OpenCode Go plan's rolling /
weekly / monthly windows (GET /zen/go/v1/usage) render in every /usage surface without adding the
provider name to the core _USAGE_FETCHERS table. Ported from #113418, which implemented the same
fetch as a core table entry; the literal endpoint (not the runtime base_url, which loses /v1 in
anthropic_messages mode) and the window mapping are theirs.
Co-authored-by: Angello Picasso <angello.picasso@devsu.com>
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