feat(v0.6.5): execution-grounded skill-utility report (adam-skill-utility)

Ranks skills by good:bad outcome co-occurrence (Wilson LB + lift vs
baseline) over the journal's active_skills payloads — the SkillsInjector
(arXiv 2605.29794) execution-grounded utility signal Δ(s), computed from
data already collected, no training.

- reuses adam-score NEGATIVE_SIGNAL_TYPES + entrySeverity (single source of truth)
- registered in install.sh helper-script copy loop
- /reflect pre-step surfaces worst below-baseline skills to the USER as
  advisory (co-occurrence != causation; not fed to the analyst's proposal machinery)
- Test 119 added; full suite 141/141 green

adam/tests/run-tests.sh

@@ -18,6 +18,7 @@ APPLYREIN="$REAL_HOME/.claude/adam/scripts/adam-apply-reinforcement.mjs"
 UPGRADE="$REAL_HOME/.claude/adam/scripts/adam-upgrade.mjs"
 BATCH="$REAL_HOME/.claude/adam/scripts/adam-batch.mjs"
 ROLLBACK="$REAL_HOME/.claude/adam/scripts/adam-rollback.mjs"
+SKILLUTIL="$REAL_HOME/.claude/adam/scripts/adam-skill-utility.mjs"
 
 TMP_HOME="$(mktemp -d -t adam-test.XXXXXX)"
 trap 'rm -rf "$TMP_HOME"' EXIT INT TERM
@@ -37,6 +38,7 @@ APPLYREIN_RUN(){ HOME="$TMP_HOME" node "$APPLYREIN" "$@" --home "$TMP_HOME/.clau
 UPGRADE_RUN() { HOME="$TMP_HOME" node "$UPGRADE" "$@"; }
 BATCH_RUN()   { HOME="$TMP_HOME" node "$BATCH" "$@"; }
 ROLLBACK_RUN(){ HOME="$TMP_HOME" node "$ROLLBACK" "$@"; }
+SKILLUTIL_RUN(){ HOME="$TMP_HOME" node "$SKILLUTIL" "$@"; }
 
 PASS=0
 FAIL=0
@@ -2148,6 +2150,32 @@ else
 fi
 rm -f "$ROOT/proposals/"*rb-ab-001* "$ROOT/applied/"*rb-ab-001* "$ROOT/ab-tracking.jsonl" "$ROOT/active-nudges.json"
 
+# --- Test 119: adam-skill-utility ranks friction-correlated skills below baseline ---
+echo "Test 119: adam-skill-utility computes per-skill good:bad utility (execution-grounded Δ)"
+reset_state
+SU_INPUT="$TMP_HOME/su-input.jsonl"
+{
+  for i in 1 2 3 4 5; do echo "{\"ts\":\"2026-05-20T0$i:00:00Z\",\"session\":\"sSU\",\"type\":\"task_completed\",\"active_skills\":[\"goodskill\"]}"; done
+  for i in 1 2 3 4 5; do echo "{\"ts\":\"2026-05-20T1$i:00:00Z\",\"session\":\"sSU\",\"type\":\"dead_end\",\"count\":8,\"active_skills\":[\"badskill\"]}"; done
+} > "$SU_INPUT"
+su_out=$(SKILLUTIL_RUN --input "$SU_INPUT" --json --min 3 2>/dev/null)
+su_check=$(echo "$su_out" | node -e '
+let buf=""; process.stdin.on("data",d=>buf+=d).on("end",()=>{
+  try {
+    const p=JSON.parse(buf);
+    const bad=p.skills.find(s=>s.skill==="badskill");
+    const good=p.skills.find(s=>s.skill==="goodskill");
+    const ok = bad && good && bad.lift<0 && good.lift>0 && p.skills[0].skill==="badskill" && bad.neg===5 && good.pos===5;
+    console.log(ok?"ok":"bad:"+JSON.stringify({bad,good,first:p.skills[0]&&p.skills[0].skill}));
+  } catch(e){ console.log("parse-error:"+e.message); }
+});')
+if [ "$su_check" = "ok" ]; then
+  echo "  PASS: badskill below baseline + ranked worst-first, goodskill above"; PASS=$((PASS+1))
+else
+  echo "  FAIL: skill-utility ranking wrong ($su_check)"; FAIL=$((FAIL+1))
+fi
+rm -f "$SU_INPUT"
+
 echo
 echo "Results: $PASS passed, $FAIL failed"
 [ "$FAIL" = "0" ]