Reduce terminal session startup latency

[BunsDev]

Summary

• Avoids fetching the full orchestration snapshot when opening or restarting terminals by resolving runtime env directly from thread and project state.
• Adds terminal history missing-state caching so brand-new sidecar terminals do not repeatedly probe for absent transcript files.
• Keeps the terminal drawer mounted and preloads it earlier in the chat flow to reduce visible launch delay and flicker.
• Adds logging and performance markers around snapshot building, env resolution, history restore, and terminal startup to make latency easier to inspect.
• Updates tests to cover the new runtime env resolver, terminal history fast path, and terminal open/restart behavior.

Testing

• Not run (PR content prepared from the provided diff)
• Existing and new tests added in the diff cover terminal manager history caching, runtime env resolution, websocket terminal fast path, and terminal drawer overlay states.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
okcode-marketing	Ready	Preview	Apr 9, 2026 7:47pm
v0-compute-the-platform-to-build	Ready	Preview, Open in v0	Apr 9, 2026 7:47pm