feat(executor): implement Gemini-based task classification and load balancing

- Add Classifier using gemini-2.0-flash-lite to automatically select agent/model.
- Update Pool to track per-agent active tasks and rate limit status.
- Enable classification for all tasks (top-level and subtasks).
- Refine SystemStatus to be dynamic across all supported agents.
- Add unit tests for the classifier and updated pool logic.
- Minor UI improvements for project selection and 'Start Next' action.

1 files changed, 49 insertions, 0 deletions

diff --git a/internal/executor/classifier_test.go b/internal/executor/classifier_test.go
new file mode 100644
index 0000000..4de44ca
--- /dev/null
+++ b/internal/executor/classifier_test.go
@@ -0,0 +1,49 @@
+package executor
+
+import (
+	"context"
+	"os"
+	"testing"
+)
+
+// TestClassifier_Classify_Mock tests the classifier with a mocked gemini binary.
+func TestClassifier_Classify_Mock(t *testing.T) {
+	// Create a temporary mock binary.
+	mockBinary := filepathJoin(t.TempDir(), "mock-gemini")
+	mockContent := `#!/bin/sh
+echo '{"agent_type": "gemini", "model": "gemini-2.0-flash", "reason": "test reason"}'
+`
+	if err := os.WriteFile(mockBinary, []byte(mockContent), 0755); err != nil {
+		t.Fatal(err)
+	}
+
+	c := &Classifier{GeminiBinaryPath: mockBinary}
+	status := SystemStatus{
+		ActiveTasks: map[string]int{"claude": 5, "gemini": 1},
+		RateLimited: map[string]bool{"claude": false, "gemini": false},
+	}
+
+	cls, err := c.Classify(context.Background(), "Test Task", "Test Instructions", status)
+	if err != nil {
+		t.Fatalf("Classify failed: %v", err)
+	}
+
+	if cls.AgentType != "gemini" {
+		t.Errorf("expected gemini, got %s", cls.AgentType)
+	}
+	if cls.Model != "gemini-2.0-flash" {
+		t.Errorf("expected gemini-2.0-flash, got %s", cls.Model)
+	}
+}
+
+func filepathJoin(elems ...string) string {
+	var path string
+	for i, e := range elems {
+		if i == 0 {
+			path = e
+		} else {
+			path = path + string(os.PathSeparator) + e
+		}
+	}
+	return path
+}