fix(sonarcloud): add missing default cases to case statements

Fixes S131 violations:
- quality-loop-helper.sh: Add default case for unknown PR status
- terminal-title-helper.sh: Add default cases for terminal detection

These were the 3 critical SonarCloud issues reported in postflight.

Author: marcusquinn

.agent/scripts/quality-loop-helper.sh

@@ -816,6 +816,9 @@ pr_review_loop() {
                     fi
                 fi
                 ;;
+            *)
+                print_warning "Unknown PR status: $status"
+                ;;
         esac
 
         iteration=$(increment_iteration)

.agent/scripts/terminal-title-helper.sh

@@ -99,6 +99,9 @@ detect_terminal() {
             echo "hyper"
             return 0
             ;;
+        *)
+            # Not a known TERM_PROGRAM, continue to TERM check
+            ;;
     esac
 
     # Check by TERM variable for other terminals
@@ -107,6 +110,9 @@ detect_terminal() {
             echo "compatible"
             return 0
             ;;
+        *)
+            # Not a known TERM, continue to other checks
+            ;;
     esac
 
     # Check for Windows Terminal