fix(nodb): set storeActive when initializing no-db mode

The `bd comment --no-db` command was failing because
initializeNoDbMode() set the global `store` but never set
`storeActive = true`. When comments.go called ensureStoreActive(),
the guard check failed and it tried to find a SQLite database,
returning an ironic error telling the user to use --no-db.

Why only `comment` was affected:
- Commands like `create`, `update`, `close` use `store` directly
- The `comment` command calls `ensureStoreActive()` first as a safety check
- That function guards on `storeActive && store != nil`
- Since `storeActive` was never set, the guard failed and it looked for SQLite

The fix aligns no-db mode with what ensureStoreActive() expects.

cmd/bd/nodb.go

@@ -72,8 +72,11 @@ func initializeNoDbMode() error {
 
 	debug.Logf("using prefix '%s'", prefix)
 
-	// Set global store
+	// Set global store and mark as active (fixes bd comment --no-db)
+	storeMutex.Lock()
 	store = memStore
+	storeActive = true
+	storeMutex.Unlock()
 	return nil
 }
 

cmd/bd/nodb_test.go

@@ -158,6 +158,90 @@ func TestDetectPrefix(t *testing.T) {
 	})
 }
 
+func TestInitializeNoDbMode_SetsStoreActive(t *testing.T) {
+	// This test verifies the fix for bd comment --no-db not working.
+	// The bug was that initializeNoDbMode() set `store` but not `storeActive`,
+	// so ensureStoreActive() would try to find a SQLite database.
+
+	tempDir := t.TempDir()
+	beadsDir := filepath.Join(tempDir, ".beads")
+	if err := os.MkdirAll(beadsDir, 0o755); err != nil {
+		t.Fatalf("Failed to create .beads dir: %v", err)
+	}
+
+	// Create a minimal JSONL file with one issue
+	jsonlPath := filepath.Join(beadsDir, "issues.jsonl")
+	content := `{"id":"bd-1","title":"Test Issue","status":"open"}
+`
+	if err := os.WriteFile(jsonlPath, []byte(content), 0o600); err != nil {
+		t.Fatalf("Failed to write JSONL: %v", err)
+	}
+
+	// Save and restore global state
+	oldStore := store
+	oldStoreActive := storeActive
+	oldCwd, _ := os.Getwd()
+	defer func() {
+		storeMutex.Lock()
+		store = oldStore
+		storeActive = oldStoreActive
+		storeMutex.Unlock()
+		_ = os.Chdir(oldCwd)
+	}()
+
+	// Change to temp dir so initializeNoDbMode finds .beads
+	if err := os.Chdir(tempDir); err != nil {
+		t.Fatalf("Failed to chdir: %v", err)
+	}
+
+	// Reset global state
+	storeMutex.Lock()
+	store = nil
+	storeActive = false
+	storeMutex.Unlock()
+
+	// Initialize no-db mode
+	if err := initializeNoDbMode(); err != nil {
+		t.Fatalf("initializeNoDbMode failed: %v", err)
+	}
+
+	// Verify storeActive is now true
+	storeMutex.Lock()
+	active := storeActive
+	s := store
+	storeMutex.Unlock()
+
+	if !active {
+		t.Error("storeActive should be true after initializeNoDbMode")
+	}
+	if s == nil {
+		t.Fatal("store should not be nil after initializeNoDbMode")
+	}
+
+	// ensureStoreActive should now return immediately without error
+	if err := ensureStoreActive(); err != nil {
+		t.Errorf("ensureStoreActive should succeed after initializeNoDbMode: %v", err)
+	}
+
+	// Verify comments work (this was the failing case)
+	ctx := rootCtx
+	comment, err := s.AddIssueComment(ctx, "bd-1", "testuser", "Test comment")
+	if err != nil {
+		t.Fatalf("AddIssueComment failed: %v", err)
+	}
+	if comment.Text != "Test comment" {
+		t.Errorf("Expected 'Test comment', got %s", comment.Text)
+	}
+
+	comments, err := s.GetIssueComments(ctx, "bd-1")
+	if err != nil {
+		t.Fatalf("GetIssueComments failed: %v", err)
+	}
+	if len(comments) != 1 {
+		t.Errorf("Expected 1 comment, got %d", len(comments))
+	}
+}
+
 func TestWriteIssuesToJSONL(t *testing.T) {
 	tempDir := t.TempDir()
 	beadsDir := filepath.Join(tempDir, ".beads")