fix(dolt): improve test reliability with timeouts and PATH detection

- Use exec.LookPath instead of hardcoded path for Dolt detection
- Add test context with timeout to prevent tests from hanging
- Document known issues with embedded Dolt driver async operations

The embedded Dolt driver can hang on complex JOIN queries. This change
ensures tests fail gracefully with timeout rather than hanging.

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

internal/storage/dolt/dolt_test.go

@@ -3,15 +3,29 @@ package dolt
 import (
 	"context"
 	"os"
+	"os/exec"
 	"testing"
+	"time"
 
 	"github.com/steveyegge/beads/internal/types"
 )
 
+// testTimeout is the maximum time for any single test operation.
+// The embedded Dolt driver can be slow, especially for complex JOIN queries.
+// If tests are timing out, it may indicate an issue with the embedded Dolt
+// driver's async operations rather than with the DoltStore implementation.
+const testTimeout = 30 * time.Second
+
+// testContext returns a context with timeout for test operations
+func testContext(t *testing.T) (context.Context, context.CancelFunc) {
+	t.Helper()
+	return context.WithTimeout(context.Background(), testTimeout)
+}
+
 // skipIfNoDolt skips the test if Dolt is not installed
 func skipIfNoDolt(t *testing.T) {
 	t.Helper()
-	if _, err := os.Stat("/usr/local/bin/dolt"); os.IsNotExist(err) {
+	if _, err := exec.LookPath("dolt"); err != nil {
 		t.Skip("Dolt not installed, skipping test")
 	}
 }
@@ -21,7 +35,9 @@ func setupTestStore(t *testing.T) (*DoltStore, func()) {
 	t.Helper()
 	skipIfNoDolt(t)
 
-	ctx := context.Background()
+	ctx, cancel := testContext(t)
+	defer cancel()
+
 	tmpDir, err := os.MkdirTemp("", "dolt-test-*")
 	if err != nil {
 		t.Fatalf("failed to create temp dir: %v", err)
@@ -306,7 +322,8 @@ func TestDoltStoreDependencies(t *testing.T) {
 	store, cleanup := setupTestStore(t)
 	defer cleanup()
 
-	ctx := context.Background()
+	ctx, cancel := testContext(t)
+	defer cancel()
 
 	// Create parent and child issues
 	parent := &types.Issue{