fix(beads): also fix FindJSONLPath to skip deletions.jsonl (bd-tqo)

Code review follow-up:
- Fix misleading docstring in FindJSONLInDir (does not return empty)
- Fix same bug in beads.FindJSONLPath (also fell back to matches[0])
- Add comprehensive tests for FindJSONLPath skipping deletions

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

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

internal/autoimport/autoimport.go

@@ -298,7 +298,7 @@ func CheckStaleness(ctx context.Context, store storage.Storage, dbPath string) (
 // FindJSONLInDir finds the JSONL file in the given directory.
 // It prefers issues.jsonl over other .jsonl files to prevent accidentally
 // reading/writing to deletions.jsonl or merge artifacts (bd-tqo fix).
-// Returns empty string if no suitable JSONL file is found.
+// Always returns a path (defaults to issues.jsonl if nothing suitable found).
 func FindJSONLInDir(dbDir string) string {
 	pattern := filepath.Join(dbDir, "*.jsonl")
 	matches, err := filepath.Glob(pattern)

internal/beads/beads.go

@@ -281,8 +281,24 @@ func FindJSONLPath(dbPath string) string {
 				return match
 			}
 		}
-		// Return the first .jsonl file found if issues.jsonl not present
-		return matches[0]
+		// bd-tqo: Fall back to beads.jsonl for legacy support
+		for _, match := range matches {
+			if filepath.Base(match) == "beads.jsonl" {
+				return match
+			}
+		}
+		// bd-tqo: Skip deletions.jsonl and merge artifacts to prevent corruption
+		for _, match := range matches {
+			base := filepath.Base(match)
+			if base == "deletions.jsonl" ||
+				base == "beads.base.jsonl" ||
+				base == "beads.left.jsonl" ||
+				base == "beads.right.jsonl" {
+				continue
+			}
+			return match
+		}
+		// If only deletions/merge files exist, fall through to default
 	}
 
 	// bd-6xd: Default to issues.jsonl (canonical name)

internal/beads/beads_test.go

@@ -220,6 +220,68 @@ func TestFindJSONLPathMultipleFiles(t *testing.T) {
 	}
 }
 
+// TestFindJSONLPathSkipsDeletions verifies that FindJSONLPath skips deletions.jsonl
+// and merge artifacts to prevent corruption (bd-tqo fix)
+func TestFindJSONLPathSkipsDeletions(t *testing.T) {
+	tests := []struct {
+		name     string
+		files    []string
+		expected string
+	}{
+		{
+			name:     "prefers issues.jsonl over deletions.jsonl",
+			files:    []string{"deletions.jsonl", "issues.jsonl"},
+			expected: "issues.jsonl",
+		},
+		{
+			name:     "skips deletions.jsonl when only option",
+			files:    []string{"deletions.jsonl"},
+			expected: "issues.jsonl", // Falls back to default
+		},
+		{
+			name:     "skips merge artifacts",
+			files:    []string{"beads.base.jsonl", "beads.left.jsonl", "issues.jsonl"},
+			expected: "issues.jsonl",
+		},
+		{
+			name:     "prefers issues over beads",
+			files:    []string{"beads.jsonl", "issues.jsonl"},
+			expected: "issues.jsonl",
+		},
+		{
+			name:     "uses beads.jsonl as legacy fallback",
+			files:    []string{"beads.jsonl", "deletions.jsonl"},
+			expected: "beads.jsonl",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tmpDir, err := os.MkdirTemp("", "beads-jsonl-test-*")
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer os.RemoveAll(tmpDir)
+
+			// Create test files
+			for _, file := range tt.files {
+				path := filepath.Join(tmpDir, file)
+				if err := os.WriteFile(path, []byte("{}"), 0644); err != nil {
+					t.Fatal(err)
+				}
+			}
+
+			dbPath := filepath.Join(tmpDir, "test.db")
+			result := FindJSONLPath(dbPath)
+			expected := filepath.Join(tmpDir, tt.expected)
+
+			if result != expected {
+				t.Errorf("FindJSONLPath() = %q, want %q", result, expected)
+			}
+		})
+	}
+}
+
 func TestFindDatabasePathHomeDefault(t *testing.T) {
 	// This test verifies that if no database is found, it falls back to home directory
 	// We can't reliably test this without modifying the home directory, so we'll skip