[codex] align chat thread title generation

[blove]

Summary

• extend inline generate_title thread-title generation to all cockpit chat Python graphs
• align the canonical chat demo with cockpit by replacing first-message slicing with an LLM-backed terminal generate_title node
• update the canonical backend tests and smoke checklist for LLM-generated metadata.title

Root Cause

Only chat/threads and chat/a2ui had the cockpit inline-title pattern. The canonical chat demo still used an older helper that sliced the first user message before response generation, so thread titles differed from the cockpit app behavior.

Validation

• /opt/homebrew/bin/uv run pytest -q in examples/chat/python -> 46 passed, 1 LangGraph deprecation warning
• python3 -m py_compile cockpit/chat/*/python/src/graph.py examples/chat/python/src/graph.py
• direct Vitest contract: cockpit/chat/footprint.spec.ts -t "wires inline thread-title generation" -> passed

[vercel]

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Project	Deployment	Actions	Updated (UTC)
threadplane	Ready	Preview, Comment	May 21, 2026 5:57pm