Luis Pater 4d68ca8a63 fix(codex): convert Grok client keepalive SSE frames to comments ...

- Add Grok client detection via User-Agent (including Gin context fallback) in a new `grokbuild` helper.
- Transform keepalive SSE `event`/`data` frames into `: keepalive` comments when streaming to Grok clients.
- Keep keepalive frames untouched for non-Grok clients while preserving existing stream translation behavior.

Closes: #5171

2026-08-22 20:58:35 +08:00

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claude/models

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codex

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grokbuild

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