Replace the fragile `re.split(b"data: ")` streaming parser with a
buffered, event-delimited parser in both the chat-completion and
Responses-API streamers. Events are accumulated until the SSE blank-line
delimiter, so parsing is independent of network chunk boundaries.
Fixes:
- OpenRouter `: OPENROUTER PROCESSING` keepalive comments no longer leak
to clients as `data: : ...` (the `Unexpected token ':'` client crash).
- JSON payloads split across TCP reads are reassembled before parsing.
- CRLF framing (Gemini native alt=sse) handled.
- Combined content+usage chunks (Gemini thinking models over the
OpenAI-compat endpoint) forward content once and still report usage in
the cost trailer, instead of dropping the assistant message.
- Multi-line non-JSON `data` blocks are re-prefixed per line so they stay
valid SSE framing for the client.
Adds tests/unit/test_streaming_sse_providers.py driving the real
generator against per-provider on-the-wire framing, and switches the
integration token-mint fallback to secrets.token_hex to kill a
PRNG/clock collision flake.
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Shroominic
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Kyle