feat: runtime-aware tmux agent checks

internal/config/loader.go

@@ -1204,6 +1204,18 @@ func BuildCrewStartupCommandWithAgentOverride(rigName, crewName, rigPath, prompt
 	return BuildStartupCommandWithAgentOverride(envVars, rigPath, prompt, agentOverride)
 }
 
+// ExpectedPaneCommands returns tmux pane command names that indicate the runtime is running.
+// For example, Claude runs as "node", while most other runtimes report their executable name.
+func ExpectedPaneCommands(rc *RuntimeConfig) []string {
+	if rc == nil || rc.Command == "" {
+		return nil
+	}
+	if filepath.Base(rc.Command) == "claude" {
+		return []string{"node"}
+	}
+	return []string{filepath.Base(rc.Command)}
+}
+
 // GetRigPrefix returns the beads prefix for a rig from rigs.json.
 // Falls back to "gt" if the rig isn't found or has no prefix configured.
 // townRoot is the path to the town directory (e.g., ~/gt).

internal/config/loader_test.go

@@ -1165,6 +1165,22 @@ func TestGetRuntimeCommand_UsesRigAgentWhenRigPathProvided(t *testing.T) {
 	}
 }
 
+func TestExpectedPaneCommands(t *testing.T) {
+	t.Run("claude maps to node", func(t *testing.T) {
+		got := ExpectedPaneCommands(&RuntimeConfig{Command: "claude"})
+		if len(got) != 1 || got[0] != "node" {
+			t.Fatalf("ExpectedPaneCommands(claude) = %v, want %v", got, []string{"node"})
+		}
+	})
+
+	t.Run("codex maps to executable", func(t *testing.T) {
+		got := ExpectedPaneCommands(&RuntimeConfig{Command: "codex"})
+		if len(got) != 1 || got[0] != "codex" {
+			t.Fatalf("ExpectedPaneCommands(codex) = %v, want %v", got, []string{"codex"})
+		}
+	})
+}
+
 func TestLoadRuntimeConfigFromSettings(t *testing.T) {
 	// Create temp rig with custom runtime config
 	dir := t.TempDir()