fix(agent): support hyphenated rig names in parseAgentIDFields (GH#868)

Complements the validation fix from c6fe9d71 - the parseAgentIDFields
function now also scans right-to-left for known role tokens instead
of using fixed position parsing.

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

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

cmd/bd/agent_test.go

@@ -101,6 +101,37 @@ func TestParseAgentIDFields(t *testing.T) {
 			wantRoleType: "polecat",
 			wantRig:      "gastown",
 		},
+		// Hyphenated rig names (GH#868)
+		{
+			name:         "polecat with hyphenated rig",
+			agentID:      "gt-my-project-polecat-nux",
+			wantRoleType: "polecat",
+			wantRig:      "my-project",
+		},
+		{
+			name:         "crew with hyphenated rig",
+			agentID:      "bd-infra-dashboard-crew-alice",
+			wantRoleType: "crew",
+			wantRig:      "infra-dashboard",
+		},
+		{
+			name:         "witness with hyphenated rig",
+			agentID:      "gt-my-cool-rig-witness",
+			wantRoleType: "witness",
+			wantRig:      "my-cool-rig",
+		},
+		{
+			name:         "refinery with hyphenated rig",
+			agentID:      "bd-super-long-rig-name-refinery",
+			wantRoleType: "refinery",
+			wantRig:      "super-long-rig-name",
+		},
+		{
+			name:         "polecat with multi-hyphen rig and name",
+			agentID:      "gt-my-awesome-project-polecat-worker-1",
+			wantRoleType: "polecat",
+			wantRig:      "my-awesome-project",
+		},
 		// Edge cases
 		{
 			name:         "no hyphen",