fix: restore file I/O + TUI status fixes + v1.6.0 #102

[four-bytes-robby]

Closes #102

Root Cause

opencode runs server plugins in a Bun Worker thread and TUI in the main thread — separate JS contexts. ESM singletons are NOT shared. File I/O is the only reliable cross-context channel.

Changes

• Restore file I/O: getBrainStatusFile() in shared.ts, file write in status.ts write(), file polling in tui.tsx alongside event bus subscription
• TUI idle fix: setStatus(data.statusText || 'ready') instead of hardcoded 'ready'
• Status bar text: 16 updateStatus() calls now include text: (status bar) alongside toast: (notification)
• Version: 1.6.0 (minor bump for event bus)
• ROADMAP: A2.1 note explains Worker architecture constraint
• Duplicate slot: removed home_footer, keep home_bottom only
• BrainStatusBar export: exposed for custom slot registration

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Summary by cubic

Restores reliable cross-context status updates by bringing back file-based I/O as a fallback alongside the event bus, fixing missing/incorrect TUI status text. Bumps @four-bytes/four-opencode-brain to v1.6.0.

• Bug Fixes

  • Re-added status file fallback: server writes status, TUI polls every 200ms via getBrainStatusFile(), while keeping the event bus as fast-path.
  • TUI now uses statusText for init and idle states (no more hardcoded "ready").
  • Standardized all updateStatus() calls to include both text (status bar) and toast (notification).

• Refactors

  • Exported BrainStatusBar for custom slot registration; removed duplicate home_footer slot (kept home_bottom).
  • Added Worker-architecture note to ROADMAP and initialized status with versioned payload and safe file writes.
  • Version bump to 1.6.0.

^{Written for commit 14552f9. Summary will update on new commits.}