fix: address v0.5.0 review findings

- Add --to/--test-cmd mutual exclusivity guard in rollback script
- Convert all jq string interpolation to --arg (cmd_extract, cmd_inject, cmd_forget)
- Fix CRITICAL/WARNING grep to match table rows only (not prose)
- Add thorough+cycle-1 guard to fast-path bash snippet in check-phase
- Clarify prev_run_id selection comment (tail -1 = most recent non-current)

lib/archeflow-memory.sh

@@ -141,14 +141,14 @@ cmd_extract() {
         if [[ "$overlap" -ge 50 ]]; then
           # Match found — update existing lesson
           local tmp_file="${LESSONS_FILE}.tmp"
-          jq -c "
-            if .id == \"$lesson_id\" then
+          jq -c --arg lid "$lesson_id" --arg ts "$(now_ts)" --arg rid "$run_id" '
+            if .id == $lid then
               .frequency += 1 |
-              .ts = \"$(now_ts)\" |
-              .last_seen_run = \"$run_id\" |
+              .ts = $ts |
+              .last_seen_run = $rid |
               .runs_since_last_seen = 0
             else . end
-          " "$LESSONS_FILE" > "$tmp_file"
+          ' "$LESSONS_FILE" > "$tmp_file"
           mv "$tmp_file" "$LESSONS_FILE"
           matched=true
           updated=$((updated + 1))
@@ -224,25 +224,25 @@ cmd_inject() {
   #   - Filter by domain (match or "general") and archetype (if provided)
   #   - Sort by frequency desc, cap at 10
   local lessons
-  lessons=$(jq -c "
+  lessons=$(jq -c --arg domain "$domain" --arg archetype "$archetype" '
     select(
-      (.type == \"preference\") or
+      (.type == "preference") or
       (.frequency >= 5) or
       (
         (.frequency >= 2) and
         (
-          (\"$domain\" == \"\") or
-          (.domain == \"$domain\") or
-          (.domain == \"general\")
+          ($domain == "") or
+          (.domain == $domain) or
+          (.domain == "general")
         ) and
         (
-          (\"$archetype\" == \"\") or
+          ($archetype == "") or
           (.archetype == null) or
-          (.archetype == \"$archetype\")
+          (.archetype == $archetype)
         )
       )
     )
-  " "$LESSONS_FILE" 2>/dev/null | jq -sc 'sort_by(-.frequency) | .[:10][]' 2>/dev/null || true)
+  ' "$LESSONS_FILE" 2>/dev/null | jq -sc 'sort_by(-.frequency) | .[:10][]' 2>/dev/null || true)
 
   if [[ -z "$lessons" ]]; then
     return 0
@@ -382,7 +382,9 @@ cmd_regression_check() {
   fi
 
   local prev_run_id
+  # Get the most recent run that is not the current one (index is append-newest-last)
   prev_run_id=$(jq -r --arg rid "$run_id" 'select(.run_id != $rid) | .run_id' "$INDEX_FILE" 2>/dev/null | tail -1)
+  # Note: tail -1 gives the last non-current entry, which is the most recent previous run
 
   if [[ -z "$prev_run_id" ]]; then
     echo "[archeflow-memory] No previous run found — skipping regression check." >&2
@@ -555,17 +557,17 @@ cmd_forget() {
   ensure_dir
 
   # Check if the lesson exists
-  if ! jq -e "select(.id == \"$target_id\")" "$LESSONS_FILE" > /dev/null 2>&1; then
+  if ! jq -e --arg tid "$target_id" 'select(.id == $tid)' "$LESSONS_FILE" > /dev/null 2>&1; then
     echo "Error: lesson $target_id not found." >&2
     exit 1
   fi
 
   # Archive the lesson
-  jq -c "select(.id == \"$target_id\")" "$LESSONS_FILE" >> "$ARCHIVE_FILE"
+  jq -c --arg tid "$target_id" 'select(.id == $tid)' "$LESSONS_FILE" >> "$ARCHIVE_FILE"
 
   # Remove from lessons
   local tmp_file="${LESSONS_FILE}.tmp"
-  jq -c "select(.id != \"$target_id\")" "$LESSONS_FILE" > "$tmp_file"
+  jq -c --arg tid "$target_id" 'select(.id != $tid)' "$LESSONS_FILE" > "$tmp_file"
   mv "$tmp_file" "$LESSONS_FILE"
 
   echo "[archeflow-memory] Forgot lesson $target_id (moved to archive)" >&2

lib/archeflow-rollback.sh

@@ -29,6 +29,12 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
+# Mutual exclusivity check
+if [[ -n "$TARGET_PHASE" && -n "$TEST_CMD" ]]; then
+  echo "ERROR: --to and --test-cmd are mutually exclusive." >&2
+  exit 2
+fi
+
 # --- Phase rollback mode ---
 if [[ -n "$TARGET_PHASE" ]]; then
   # Validate phase name