docs(release-notes): week of 2026-10-19 — observability for code agents - #1119

Follow-up to #1035. It makes three changes to the Week of 2026-10-19 section:

• Adds a Features bullet, Observability for Code Agents in Simulations.
• Adds a Bugs/Improvements bullet, Realtime WebSocket Connections Through the Gateway.
• Removes the "held for confirmation" clause from that section's SKIPPED note.

The observability bullet covers what shipped in the platform's v1.53.0 release:

• The "Turn on observability" option when you create an environment from a repository or an upload. It is off by default and needs traceAI or OpenTelemetry instrumentation.
• The observability switch on a code agent's Definition tab.
• The run page's Traces tab, which shows 20 traces per page, opens each in a read-only trace view, and has an "off" state that links to Enable observability.
• Simulated traces stay out of Observe projects.
• The MCP get_trace / get_span tools take a run id.

The WebSocket bullet covers what shipped in v1.54.0 for the public /v1/realtime endpoint:

• Clients can open a WebSocket to it through the Gateway.
• The Gateway pings clients every 30 seconds, so sessions stay connected while busy or idle.
• A provider's final messages are delivered to the client before the session closes.

Each clause comes from the merged platform PRs' descriptions. Gate clean (leak-scan, check.sh).

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