feat(deps): add minimum beads version check (gt-im3fl)

Add version check that enforces beads >= 0.44.0 at CLI startup,
required for custom type support (bd-i54l). Commands like version,
help, and completion bypass the check.

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

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

internal/cmd/beads_version_test.go

@@ -0,0 +1,68 @@
+package cmd
+
+import "testing"
+
+func TestParseBeadsVersion(t *testing.T) {
+	tests := []struct {
+		input   string
+		want    beadsVersion
+		wantErr bool
+	}{
+		{"0.44.0", beadsVersion{0, 44, 0}, false},
+		{"1.2.3", beadsVersion{1, 2, 3}, false},
+		{"0.44.0-dev", beadsVersion{0, 44, 0}, false},
+		{"v0.44.0", beadsVersion{0, 44, 0}, false},
+		{"0.44", beadsVersion{0, 44, 0}, false},
+		{"10.20.30", beadsVersion{10, 20, 30}, false},
+		{"invalid", beadsVersion{}, true},
+		{"", beadsVersion{}, true},
+		{"a.b.c", beadsVersion{}, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got, err := parseBeadsVersion(tt.input)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("parseBeadsVersion(%q) error = %v, wantErr %v", tt.input, err, tt.wantErr)
+				return
+			}
+			if !tt.wantErr && got != tt.want {
+				t.Errorf("parseBeadsVersion(%q) = %+v, want %+v", tt.input, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestBeadsVersionCompare(t *testing.T) {
+	tests := []struct {
+		v1   string
+		v2   string
+		want int
+	}{
+		{"0.44.0", "0.44.0", 0},
+		{"0.44.0", "0.43.0", 1},
+		{"0.43.0", "0.44.0", -1},
+		{"1.0.0", "0.99.99", 1},
+		{"0.44.1", "0.44.0", 1},
+		{"0.44.0", "0.44.1", -1},
+		{"1.2.3", "1.2.3", 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.v1+"_vs_"+tt.v2, func(t *testing.T) {
+			v1, err := parseBeadsVersion(tt.v1)
+			if err != nil {
+				t.Fatalf("failed to parse v1 %q: %v", tt.v1, err)
+			}
+			v2, err := parseBeadsVersion(tt.v2)
+			if err != nil {
+				t.Fatalf("failed to parse v2 %q: %v", tt.v2, err)
+			}
+
+			got := v1.compare(v2)
+			if got != tt.want {
+				t.Errorf("(%s).compare(%s) = %d, want %d", tt.v1, tt.v2, got, tt.want)
+			}
+		})
+	}
+}