logout: fix stale revokeCurrentFunc doc comment
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The comment claimed the impl resolves its own data-API bearer; the caller now resolves the active context's core URL + token and binds them into the closure. Describe the actual contract.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: 2525dd1ceb9f
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