feat: migrate brain to bus system — real-time push with HTTP fallback

[four-bytes-robby]

Summary

• Migrate brain plugin to use plugin bus for real-time status push (WebSocket) with HTTP fallback
• Update @four-bytes/opencode-plugin-lib dependency from v0.3.0 → v0.4.0 (adds BusClient/BusTui)
• status.ts: publish status via BusClient.publish() on every write
• tui.tsx: subscribe to bus via BusTui.connect() for real-time push, HTTP polling as fallback

Changes

• src/status.ts — Import and use BusClient for real-time bus push on status updates
• src/tui.tsx — Import and use BusTui for WebSocket subscription alongside HTTP fallback polling
• package.json — Bump plugin-lib to v0.4.0 for bus classes
• bun.lock — Updated lockfile

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Summary by cubic

Migrate the brain plugin to the plugin bus for real-time WebSocket updates with HTTP fallback. Adds session-scoped channels, ingest progress, and safe reconnect/unmount handling; stops polling once the socket connects and uses @four-bytes/opencode-plugin-lib v0.5.0.

• New Features

  • Publish status to brain/{sessionID} via BusClient (fallback to brain/status when no session).
  • Wire session IDs end-to-end: set on chat.message via setSessionId; pass session_id to the sidebar TUI.
  • TUI subscribes via BusTui; keeps HTTP polling as fallback; shows ingest progress with ProgressBar.

• Bug Fixes

  • Remove duplicate ProgressBar in the non-centered status row ([bug] duplicate ProgressBar renders in non-centered Brain sidebar #133).
  • Resolve merge conflicts with main (no behavior changes).

^{Written for commit 21c8b33. Summary will update on new commits.}

[cubic-dev-ai]

3 issues found across 4 files

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[cubic-dev-ai]

1 issue found across 3 files (changes from recent commits).

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[cubic-dev-ai]

2 issues found across 3 files (changes from recent commits).

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Fix all with cubic | Re-trigger cubic</sub>

[cubic-dev-ai]

1 issue found across 2 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Fix all with cubic | Re-trigger cubic</sub>