feat: stream worktree output in list command

[Copilot]

The list command was buffering all worktrees before printing. Changed to stream output as worktrees are processed.

Changes

• Non-JSON output: Print legend immediately, then stream each worktree as received from streamWorktrees() generator
• JSON output: Still buffers (required for valid JSON array structure)
• Filter logic: Extracted to shouldIncludeWorktree() helper to eliminate duplication
• Empty state tracking: Split foundAny (any worktrees exist) from matchedAny (any pass filters) for accurate messaging

// Before: collected all, then printed
const worktrees: Worktree[] = [];
for await (const wt of manager.streamWorktrees()) {
  worktrees.push(wt);
}
for (const wt of worktrees) {
  printWorktreeItem(wt, options);
}

// After: print as they stream
for await (const wt of manager.streamWorktrees()) {
  printWorktreeItem(wt, options);
}

Improves perceived performance for repos with many worktrees.

Original prompt

The list command currently aggregates everything from the streamWorktrees async generator to a list instead of printing as it goes. Update the implementation to print as it processes values from the generator.

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[github-actions]

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