Chat/sse

Armaan Guptarequested to merge
chat/sse into develop

Description :

POST /chat/api/message now streams the turn as Server-Sent Events instead of one JSON blob:

  • token : text deltas as the model generates
  • tool : per tool call, started/finished/error (UI can show "searching the corpus…")
  • done : final tally (tool-call count) / error - clean error envelope mid-stream
  • Abort end-to-end: client disconnect cancels the in-flight LLM call and MCP tool calls
  • Fix: malformed JSON bodies now get our 400 envelope (Express default leaked an HTML stack trace)

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