Fix tracing leak and review findings in the MIL-001 script

Switch off set -x (it printed tokens), accept a byte order mark, strip the
carriage return jq adds on Windows, return the first key without jq, rename
the boolean keys, and cite the task in the header. Add regression tests and
review record RC-016.

Task: MIL-001#2
Task: MIL-001#3
Task: MIL-001#4
Task: MIL-001#6

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/lib.sh

@@ -83,7 +83,7 @@ new_workdir() {
 # first, then the now empty directories from the bottom up.
 remove_workdir() {
   if [[ -n $WORK && -d $WORK ]]; then
-    find "$WORK" -type f -delete
+    find "$WORK" \( -type f -o -type p \) -delete
     find "$WORK" -depth -type d -exec rmdir {} +
   fi
   WORK=""