luulam e438a03f96 feat(open-sse): early-peek stream error detection + fix UTF-8 loss in CommandCode peek ...

- new open-sse/utils/streamErrorPeek.js: bounded peek of the first bytes of a
  200 stream; configured pattern match → 502 so account/combo fallback can run
  before any byte reaches the client (streaming included). Re-emits RAW bytes
  so split multi-byte UTF-8 sequences survive the peek (never re-encode
  decoded text — TextDecoder flush corrupts a lone leading byte to U+FFFD).
- chatCore: run the peek after executor.execute when the provider has
  streamErrorPatterns configured; chat.js passes the settings through.
- commandcode executor: same raw-bytes fix in peekForUpstreamError + regression
  test that fails against the old flush-based re-encode.

2026-08-04 23:33:12 +07:00

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