Merge fix/spawn-beads-path: add gt nudge command

Key changes:
- Add gt nudge command for reliable Claude session messaging
- spawn.go now uses NudgeSession instead of SendKeysDebounced
- Fix templates test to match actual deacon template text

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

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

internal/templates/templates_test.go

@@ -99,7 +99,7 @@ func TestRenderRole_Deacon(t *testing.T) {
 	if !strings.Contains(output, "/test/town") {
 		t.Error("output missing town root")
 	}
-	if !strings.Contains(output, "Health-Check Orchestrator") {
+	if !strings.Contains(output, "Health Orchestrator") {
 		t.Error("output missing role description")
 	}
 	if !strings.Contains(output, "Wake Cycle") {