chore: bump version to 0.43.0 (bd-lejq)

- Update Version in cmd/bd/version.go: 0.42.0 → 0.43.0
- Update CHANGELOG.md with 0.43.0 section
- Fix test isolation in TestTrackBdVersion_NoBeadsDir

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

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

cmd/bd/version.go

@@ -14,7 +14,7 @@ import (
 
 var (
 	// Version is the current version of bd (overridden by ldflags at build time)
-    Version = "0.42.0"
+    Version = "0.43.0"
 	// Build can be set via ldflags at compile time
 	Build = "dev"
 	// Commit and branch the git revision the binary was built from (optional ldflag)

cmd/bd/version_tracking_test.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/steveyegge/beads/internal/git"
 	"github.com/steveyegge/beads/internal/storage/sqlite"
 )
 
@@ -96,6 +97,9 @@ func TestGetVersionsSinceOrder(t *testing.T) {
 }
 
 func TestTrackBdVersion_NoBeadsDir(t *testing.T) {
+	// Reset global state for test isolation
+	ensureCleanGlobalState(t)
+
 	// Save original state
 	origUpgradeDetected := versionUpgradeDetected
 	origPreviousVersion := previousVersion
@@ -104,10 +108,21 @@ func TestTrackBdVersion_NoBeadsDir(t *testing.T) {
 		previousVersion = origPreviousVersion
 	}()
 
+	// Reset state to ensure clean starting point
+	versionUpgradeDetected = false
+	previousVersion = ""
+
 	// Change to temp directory with no .beads
 	tmpDir := t.TempDir()
 	t.Chdir(tmpDir)
 
+	// Reset git caches so IsWorktree() returns fresh results for the temp dir
+	git.ResetCaches()
+
+	// Set BEADS_DIR to temp directory to prevent FindBeadsDir from walking up
+	// or finding the worktree's main repository .beads directory
+	t.Setenv("BEADS_DIR", tmpDir)
+
 	// trackBdVersion should silently succeed
 	trackBdVersion()