refactor: remove unused bd pin/unpin/hook commands (bd-x0zl)

Analysis found these commands are dead code:
- gt never calls `bd pin` - uses `bd update --status=pinned` instead
- Beads.Pin() wrapper exists but is never called
- bd hook functionality duplicated by gt mol status
- Code comment says "pinned field is cosmetic for bd hook visibility"

Removed:
- cmd/bd/pin.go
- cmd/bd/unpin.go
- cmd/bd/hook.go

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

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

cmd/bd/test_wait_helper.go

@@ -5,6 +5,8 @@ import (
 	"os/exec"
 	"testing"
 	"time"
+
+	"github.com/steveyegge/beads/internal/git"
 )
 
 // waitFor repeatedly evaluates pred until it returns true or timeout expires.
@@ -37,11 +39,15 @@ func setupGitRepo(t *testing.T) (repoPath string, cleanup func()) {
 		t.Fatalf("failed to change to temp directory: %v", err)
 	}
 
-	// Initialize git repo
-	if err := exec.Command("git", "init").Run(); err != nil {
+	// Reset git caches after changing directory
+	git.ResetCaches()
+
+	// Initialize git repo with 'main' as default branch (modern git convention)
+	if err := exec.Command("git", "init", "--initial-branch=main").Run(); err != nil {
 		_ = os.Chdir(originalWd)
 		t.Fatalf("failed to init git repo: %v", err)
 	}
+	git.ResetCaches()
 
 	// Configure git
 	_ = exec.Command("git", "config", "user.email", "test@test.com").Run()
@@ -60,6 +66,7 @@ func setupGitRepo(t *testing.T) (repoPath string, cleanup func()) {
 
 	cleanup = func() {
 		_ = os.Chdir(originalWd)
+		git.ResetCaches()
 	}
 
 	return tmpDir, cleanup
@@ -80,11 +87,15 @@ func setupGitRepoWithBranch(t *testing.T, branch string) (repoPath string, clean
 		t.Fatalf("failed to change to temp directory: %v", err)
 	}
 
+	// Reset git caches after changing directory
+	git.ResetCaches()
+
 	// Initialize git repo with specific branch
 	if err := exec.Command("git", "init", "-b", branch).Run(); err != nil {
 		_ = os.Chdir(originalWd)
 		t.Fatalf("failed to init git repo: %v", err)
 	}
+	git.ResetCaches()
 
 	// Configure git
 	_ = exec.Command("git", "config", "user.email", "test@test.com").Run()
@@ -103,6 +114,7 @@ func setupGitRepoWithBranch(t *testing.T, branch string) (repoPath string, clean
 
 	cleanup = func() {
 		_ = os.Chdir(originalWd)
+		git.ResetCaches()
 	}
 
 	return tmpDir, cleanup
@@ -123,8 +135,11 @@ func setupMinimalGitRepo(t *testing.T) (repoPath string, cleanup func()) {
 		t.Fatalf("failed to change to temp directory: %v", err)
 	}
 
-	// Initialize git repo
-	if err := exec.Command("git", "init").Run(); err != nil {
+	// Reset git caches after changing directory
+	git.ResetCaches()
+
+	// Initialize git repo with 'main' as default branch (modern git convention)
+	if err := exec.Command("git", "init", "--initial-branch=main").Run(); err != nil {
 		_ = os.Chdir(originalWd)
 		t.Fatalf("failed to init git repo: %v", err)
 	}
@@ -135,6 +150,7 @@ func setupMinimalGitRepo(t *testing.T) (repoPath string, cleanup func()) {
 
 	cleanup = func() {
 		_ = os.Chdir(originalWd)
+		git.ResetCaches()
 	}
 
 	return tmpDir, cleanup