Fix: Change default JSONL filename from beads.jsonl to issues.jsonl

The canonical beads database name is issues.jsonl. Tens of thousands of users
have issues.jsonl, and beads.jsonl was only used by the Beads project itself
due to git history pollution.

Changes:
- Updated bd doctor to warn about beads.jsonl instead of issues.jsonl
- Changed default config from beads.jsonl to issues.jsonl
- Reversed precedence in checkGitForIssues to prefer issues.jsonl
- Updated git merge driver config to use issues.jsonl
- Updated all tests to expect issues.jsonl as the default

issues.jsonl is now the canonical default; beads.jsonl is legacy

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

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

internal/beads/beads.go

@@ -242,8 +242,8 @@ func FindJSONLPath(dbPath string) string {
 		return matches[0]
 	}
 
-	// Default to beads.jsonl
-	return filepath.Join(dbDir, "beads.jsonl")
+	// Default to issues.jsonl
+	return filepath.Join(dbDir, "issues.jsonl")
 }
 
 // DatabaseInfo contains information about a discovered beads database

internal/beads/beads_test.go

@@ -168,9 +168,9 @@ func TestFindJSONLPathDefault(t *testing.T) {
 	// Create a fake database path (no .jsonl files exist)
 	dbPath := filepath.Join(tmpDir, "test.db")
 
-	// Should return default beads.jsonl
+	// Should return default issues.jsonl
 	result := FindJSONLPath(dbPath)
-	expected := filepath.Join(tmpDir, "beads.jsonl")
+	expected := filepath.Join(tmpDir, "issues.jsonl")
 	if result != expected {
 		t.Errorf("Expected '%s', got '%s'", expected, result)
 	}

internal/configfile/configfile.go

@@ -17,7 +17,7 @@ type Config struct {
 func DefaultConfig() *Config {
 	return &Config{
 		Database:    "beads.db",
-		JSONLExport: "beads.jsonl",
+		JSONLExport: "issues.jsonl",
 	}
 }
 
@@ -89,7 +89,7 @@ func (c *Config) DatabasePath(beadsDir string) string {
 
 func (c *Config) JSONLPath(beadsDir string) string {
 	if c.JSONLExport == "" {
-		return filepath.Join(beadsDir, "beads.jsonl")
+		return filepath.Join(beadsDir, "issues.jsonl")
 	}
 	return filepath.Join(beadsDir, c.JSONLExport)
 }

internal/configfile/configfile_test.go

@@ -12,9 +12,9 @@ func TestDefaultConfig(t *testing.T) {
 	if cfg.Database != "beads.db" {
 		t.Errorf("Database = %q, want beads.db", cfg.Database)
 	}
-	
-	if cfg.JSONLExport != "beads.jsonl" {
-		t.Errorf("JSONLExport = %q, want beads.jsonl", cfg.JSONLExport)
+
+	if cfg.JSONLExport != "issues.jsonl" {
+		t.Errorf("JSONLExport = %q, want issues.jsonl", cfg.JSONLExport)
 	}
 }
 
@@ -84,8 +84,8 @@ func TestJSONLPath(t *testing.T) {
 	}{
 		{
 			name: "default",
-			cfg:  &Config{JSONLExport: "beads.jsonl"},
-			want: filepath.Join(beadsDir, "beads.jsonl"),
+			cfg:  &Config{JSONLExport: "issues.jsonl"},
+			want: filepath.Join(beadsDir, "issues.jsonl"),
 		},
 		{
 			name: "custom",
@@ -95,7 +95,7 @@ func TestJSONLPath(t *testing.T) {
 		{
 			name: "empty falls back to default",
 			cfg:  &Config{JSONLExport: ""},
-			want: filepath.Join(beadsDir, "beads.jsonl"),
+			want: filepath.Join(beadsDir, "issues.jsonl"),
 		},
 	}