Chat: stamp optimistic placeholder with job_id for in-flight activity timeline

Chat: rewrite inline activity timeline to poll /jobs/{id}/logs

Chat: fix optimistic placeholder ordering race after API round-trip

Worker: revert --security-opt no-new-privileges (incompatible with prod host)

Chat: linefeeds, time order, faster thinking, inline activity timeline

Worker: stop leaking tool credentials via -e flags and workspace files

Chat: render mermaid diagrams in markdown messages

Chat: make files_written chips downloadable

Fix chat: lift state to provider, reverse list, binary artifact download

Chat: direct tool execution with derived images + credential injection

Fix SSE: use native fetch + ReadableStream instead of Dio

Add error logging to chat SSE pub/sub connection

Fix: keep SSE stream alive across messages for real-time thinking

Fix: keep thinking section expanded while response is still streaming

Chat: real-time thinking stream, tool activity, and cancel support