fix(peek): Support cross-rig crew paths like beads/crew/dave

gt peek now correctly handles crew worker paths by detecting the crew/
prefix and using the proper crew session name format (gt-{rig}-crew-{name}).

Changes:
- Add CaptureSession method to Manager for raw session ID capture
- Detect crew/ prefix in peek command and use CrewSessionName
- Update help text with crew path examples

Fixes: gt-yud21

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/session/manager.go

@@ -395,6 +395,21 @@ func (m *Manager) Capture(polecat string, lines int) (string, error) {
 	return m.tmux.CapturePane(sessionID, lines)
 }
 
+// CaptureSession returns the recent output from a session by raw session ID.
+// Use this for crew workers or other non-polecat sessions where the session
+// name doesn't follow the standard gt-{rig}-{polecat} pattern.
+func (m *Manager) CaptureSession(sessionID string, lines int) (string, error) {
+	running, err := m.tmux.HasSession(sessionID)
+	if err != nil {
+		return "", fmt.Errorf("checking session: %w", err)
+	}
+	if !running {
+		return "", ErrSessionNotFound
+	}
+
+	return m.tmux.CapturePane(sessionID, lines)
+}
+
 // Inject sends a message to a polecat session.
 // Uses a longer debounce delay for large messages to ensure paste completes.
 func (m *Manager) Inject(polecat, message string) error {