fix(jira): log when no matching workflow transition is available

When applyTransition cannot find a transition matching the desired status,
log it via debug.Logf so users can diagnose workflow restriction issues.
Follow-up to PR gastownhall#2157.

Co-Authored-By: Ryan Bagwell <ryanbagwell@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

internal/jira/tracker.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/steveyegge/beads/internal/debug"
 	"github.com/steveyegge/beads/internal/storage"
 	"github.com/steveyegge/beads/internal/tracker"
 	"github.com/steveyegge/beads/internal/types"
@@ -204,6 +205,7 @@ func (t *Tracker) applyTransition(ctx context.Context, key string, status types.
 		}
 	}
 
+	debug.Logf("jira: no available transition to %q for %s (%d transitions checked)\n", desiredName, key, len(transitions))
 	return nil
 }