ui(test): green OK/PASS, red FAIL - terminal-only, NO_COLOR-aware

Owner feedback: grep match-highlighting made the word 'policy' red while
status words were plain - counter-indicative. Suites + verify now emit
ANSI colors (green success, red failure) when stdout is a terminal;
piped/machine-parsed output stays plain, honoring NO_COLOR. Word 'ok'
promoted to 'OK' for scannability.

Verified byte-level via forced-pty run; piped output unchanged; suites
41/24/14 + verify green.

scripts/verify.sh

@@ -16,6 +16,13 @@ source scripts/common.sh
 
 EXPECTED="${EXPECTED_MARKER:-MOSAIC_HELLO_OK}"
 
+# Status colors: terminal-only, NO_COLOR-respecting; plain when piped.
+if [ -t 1 ] && [ -z "${NO_COLOR:-}" ]; then
+    C_OK=$'\033[0;32m'; C_FAIL=$'\033[0;31m'; C_RESET=$'\033[0m'
+else
+    C_OK=""; C_FAIL=""; C_RESET=""
+fi
+
 load_config
 load_release
 IMAGE="$MOSAIC_IMAGE_TAG"
@@ -51,11 +58,11 @@ TRIMMED="$(printf '%s' "$RESPONSE" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]
 
 # 4-6. Exact comparison gate.
 if [ "$TRIMMED" = "$EXPECTED" ]; then
-    echo "PASS: response matches expected marker"
+    echo "${C_OK}PASS${C_RESET}: response matches expected marker"
     exit 0
 fi
 
-echo "FAIL: response does not match expected marker" >&2
+echo "${C_FAIL}FAIL${C_RESET}: response does not match expected marker" >&2
 printf 'expected: %s\n' "$EXPECTED" >&2
 printf 'actual  : %s\n' "$TRIMMED" >&2
 exit 1