When an announce (child trace) run starts, toggle the parent trace
status to "running" so the UI doesn't show "completed" with a running
child span. Restore to "completed" when the announce finishes.
Spans are now emitted BEFORE execution starts with status "running" and
input visible, then updated when the step completes. This lets users see
what the system is doing during long-running LLM calls and tool executions.
- Add EmitSpanUpdate() to collector with separate update buffer
- Flush ordering: batch INSERT new spans first, then process updates
- Split LLM/tool/agent spans into start/end pairs (agent loop + subagent)
- Emit tool span end inside goroutines for parallel calls (no orphans)
- EmitSpanUpdate is a channel send — works after ctx cancellation
- Update go.mod and Dockerfile to Go 1.26
- Apply `go fix ./...` stdlib modernizations across 170+ files
- Add `go fix` to post-implementation checklist in CLAUDE.md
- Fix go fix misapplied rewrite in loop_history.go
viettranx