fix(effort): five residual LOW on lib/effort-pins.sh

INT/TERM trap removes the mktemp sibling and exits 130 (traps restored,
never EXIT); re-read message honest and reached by a stubbed test; rejected
map line printed through printf %q; suite guards mktemp -d and skips the
read-only case under root. Cases T13b, T15, T15b, T16.

.claude/tasks/TODO.md

@@ -19,7 +19,7 @@ quality/price trade-off is tier × effort, never version.
 - [x] S7 contract + GATE 0 + fresh verifier + security gate, make test, shellcheck — GATE 0 MET, verifier ECARTS(3) → executor moved the resync re-apply after the 21st refresh (real gap), scope gated, directive authorized → CONFORME 7/7; security PASS (4 LOW on the helper, see journal); make test 44 suites rc 0
 - [x] S8 registries BDR-108, LRN-181, LRN-182, BLK-024, EVAL-038 (user go) + journal
 - [x] S9 hardening of lib/effort-pins.sh (4 LOW, user go): fresh executor, T11-T14, verifier CONFORME 9/9, security PASS
-- [ ] parked LOW (security re-gate 2026-09-29, none exploitable): no RETURN trap on the mktemp sibling (SIGINT during awk leaves `SKILL.md.XXXXXX`); T13 never reaches the post-write re-read branch (CRLF opener fails `_effort_pin_closed` first, fixture with LF delimiters + CRLF `name:` line would); T14 fails under root (chmod ignored); `WORK="$(mktemp -d)"` unguarded in the suite (`|| exit 1`); install-plugins.sh `err()` uses `echo -e` on the rejected map line
+- [x] parked LOW (security re-gate 2026-09-29, none exploitable; done on bugfix/effort-pins-low, user go "fais les cinq low restants"): no RETURN trap on the mktemp sibling (SIGINT during awk leaves `SKILL.md.XXXXXX`); T13 never reaches the post-write re-read branch (CRLF opener fails `_effort_pin_closed` first, fixture with LF delimiters + CRLF `name:` line would); T14 fails under root (chmod ignored); `WORK="$(mktemp -d)"` unguarded in the suite (`|| exit 1`); install-plugins.sh `err()` uses `echo -e` on the rejected map line
 - UNMERGED — human gate ("merge it")
 
 ## 2026-09-28 — effort tiering: session high, agent pins, skill levels, phase shifts (feature/effort-tiering)

.claude/tasks/contracts/2026-09-29-effort-pins-low-1644.md

@@ -0,0 +1,41 @@
+# CONTRACT — effort-pins-low
+- date: 2026-09-29 | flow: bugfix by hand (bugfix/* off develop) | branch: bugfix/effort-pins-low
+- status: active
+
+## REQUEST (verbatim — IMMUTABLE)
+> fais les cinq low restants
+> [the five LOW parked in TODO after the 2026-09-29 security re-gate of BDR-108: no signal trap on the mktemp sibling; T13 never reaches the post-write re-read branch; T14 fails under root; `WORK="$(mktemp -d)"` unguarded in the suite; install-plugins.sh `err()` uses `echo -e` on the rejected map line]
+
+## CLARIFICATIONS
+- Pass A silent autofill (bugfix). Pass B: nothing visible or public opens; messages may change wording.
+- LOW 1 (signal): `_effort_pin_write` installs an INT/TERM trap that removes `$tmp` and exits 130 for the duration of the cp/awk/mv chain, then restores the previous INT/TERM traps on every return path. NEVER an EXIT trap: install-plugins.sh runs a guarded-config EXIT trap the helper must not replace.
+- LOW 2 (T13): the post-write re-read branch is unreachable through the file system once `_effort_pin_closed` has passed (the awk always inserts at the closing `---`); it stays as a post-condition of the awk, its message drops the misleading "(CRLF …)" hint, and a unit test reaches it by stubbing `_effort_pin_write` to a no-op inside a subshell that sourced the lib. T13 keeps proving a CRLF file is rejected (renamed to what it proves).
+- LOW 3 (root): T14 prints a visible SKIP and counts nothing when `id -u` is 0 (chmod bits are ignored as root).
+- LOW 4: `WORK="$(mktemp -d)" || exit 1` in the suite.
+- LOW 5: the helper prints the rejected map line through `printf '%q'` so a caller's `echo -e` err() cannot interpret backslash escapes from map content; install-plugins.sh `err()` itself is untouched (other messages rely on `-e`).
+
+## ACCEPTANCE CRITERIA
+1. Signal safety: a SIGINT delivered during the awk write leaves no `SKILL.md.*` sibling and the process exits 130; on a normal return the previous INT/TERM trap state is restored and no EXIT trap was set. Case `T15-sigint-removes-temp` + `T15b-traps-restored`.
+   CHECK: out=$(make test suite=lib/tests/effort-pins.test.sh 2>&1); echo "$out" | grep -q 'effort-pins: [0-9]* pass, 0 fail' || { echo "$out" | grep FAIL; exit 1; }; for k in T15-sigint-removes-temp T15b-traps-restored; do echo "$out" | grep -q "PASS $k" || { echo "missing PASS $k"; exit 1; }; done; ! grep -qE 'trap [^#]*EXIT' lib/effort-pins.sh && echo SIGNAL_OK
+   EXPECT: SIGNAL_OK
+   EVIDENCE: MET exit=0 marker-found :: SIGNAL_OK
+2. Re-read branch reached: a test stubs `_effort_pin_write` to a no-op and asserts `_effort_pin_apply_one` returns 1 with an err line naming the file; the message no longer mentions CRLF; T13 is renamed `T13-crlf-file-rejected`.
+   CHECK: out=$(make test suite=lib/tests/effort-pins.test.sh 2>&1); for k in T13-crlf-file-rejected T13b-reread-mismatch-fails; do echo "$out" | grep -q "PASS $k" || { echo "missing PASS $k"; exit 1; }; done; ! grep -q 'CRLF or malformed' lib/effort-pins.sh && echo REREAD_OK
+   EXPECT: REREAD_OK
+   EVIDENCE: MET exit=0 marker-found :: REREAD_OK
+3. Suite hardening: `WORK` guarded, T14 skips visibly under root (the skip path is exercised by faking `id -u` through a function override in a subshell run of the T14 block, or by an explicit `EFFORT_PINS_TEST_FAKE_ROOT=1` hook read by the suite).
+   CHECK: grep -q 'WORK="$(mktemp -d)" || exit 1' lib/tests/effort-pins.test.sh && out=$(EFFORT_PINS_TEST_FAKE_ROOT=1 make test suite=lib/tests/effort-pins.test.sh 2>&1) && echo "$out" | grep -q 'SKIP T14' && echo "$out" | grep -q 'effort-pins: [0-9]* pass, 0 fail' && echo SUITE_OK
+   EXPECT: SUITE_OK
+   EVIDENCE: MET exit=0 marker-found :: SUITE_OK
+4. Escape-safe rejection message: a map line `bad\tname high` (literal backslash-t) is rejected and the err text carries the shell-quoted form (`bad\\tname`), so an `echo -e` caller prints it verbatim. Case `T16-rejected-line-quoted`.
+   CHECK: out=$(make test suite=lib/tests/effort-pins.test.sh 2>&1); echo "$out" | grep -q 'PASS T16-rejected-line-quoted' && grep -q "printf '%q'" lib/effort-pins.sh && echo QUOTE_OK
+   EXPECT: QUOTE_OK
+   EVIDENCE: MET exit=0 marker-found :: QUOTE_OK
+5. Everything else green: shellcheck on the helper and suite, effort-routing census, live tree idempotent (0 applied, 0 failed), doctrine-citers.
+   CHECK: shellcheck lib/effort-pins.sh lib/tests/effort-pins.test.sh && make test suite=lib/tests/effort-routing.test.sh 2>&1 | grep -q 'census: [0-9]* pass, 0 fail' && bash lib/effort-pins.sh 2>&1 | grep -q ' 0 applied, [0-9]* already at level, 0 failed' && make test suite=lib/tests/no-vacuous-locks.test.sh >/dev/null 2>&1 && echo STABLE_OK
+   EXPECT: STABLE_OK
+   EVIDENCE: MET exit=0 marker-found :: STABLE_OK
+
+## FILE SCOPE
+- lib/effort-pins.sh, lib/tests/effort-pins.test.sh
+- .claude/tasks/TODO.md (parked LOW line ticked), CHANGELOG.md (Fixed line), this contract

CHANGELOG.md

@@ -463,6 +463,7 @@ Format follows [Keep a Changelog](https://keepachangelog.com/).
   plugin cache or `claude plugin list`.
 
 ### Fixed
+- `lib/effort-pins.sh` residual LOW (security re-gate of BDR-108): INT/TERM trap removes the mktemp sibling and exits 130 (never an EXIT trap, the installer owns one); the post-write re-read message no longer claims CRLF and is reached by a stubbed unit test; the rejected map line is printed through `printf '%q'` so a caller's `echo -e` cannot interpret map content; the fixture suite guards its `mktemp -d` and skips the read-only case visibly under root.
 - `update-all.sh` re-fetched the vendored skills at every run but never re-applied the effort pins: brainstorming/writing-plans lost their xhigh until the next `make plugin` (BDR-107 gap, closed by `lib/effort-pins.sh`).
 - **gitflow pre-commit blocked every commit with gitleaks 8.16** (Ubuntu's apt
   package): the hook ran `gitleaks git --staged`, a subcommand that exists from

lib/effort-pins.sh

@@ -38,13 +38,22 @@ _effort_pin_closed() {
   awk 'NR==1&&/^---$/{p=1;next} p&&/^---$/{f=1;exit} END{exit !f}' "$1"
 }
 
+# _effort_pin_traps_restore <saved> — drop the INT/TERM handlers set for the
+# write and re-install the caller's saved ones. No exit-time handler here.
+_effort_pin_traps_restore() {
+  trap - INT TERM
+  [ -z "$1" ] || eval "$1"
+}
+
 # _effort_pin_write <skill-file> <name> <level> — replace the frontmatter
 # `effort:` line, or insert one after `name: <name>` (before the closing
 # `---` when the frontmatter has no name line). Body lines never change.
 # Writes a mktemp sibling then renames; any failure leaves no temp behind.
 _effort_pin_write() {
-  local file="$1" name="$2" level="$3" tmp
+  local file="$1" name="$2" level="$3" tmp prev rc
   tmp="$(mktemp "$file.XXXXXX")" || return 1
+  prev="$(trap -p INT TERM)"
+  trap 'rm -f "$tmp"; exit 130' INT TERM
   cp -p "$file" "$tmp" && awk -v n="$name" -v lvl="$level" '
     NR==1 && /^---$/ { fm=1; print; next }
     fm && /^---$/ {
@@ -54,9 +63,10 @@ _effort_pin_write() {
     fm && /^effort: / { if (!done) { print "effort: " lvl; done=1 }; next }
     fm && $0 == "name: " n { print; if (!done) { print "effort: " lvl; done=1 }; next }
     { print }
-  ' "$file" > "$tmp" && mv "$tmp" "$file" && return 0
+  ' "$file" > "$tmp" && mv "$tmp" "$file"; rc=$?
-  rm -f "$tmp"
+  [ "$rc" -eq 0 ] || rm -f "$tmp"
-  return 1
+  _effort_pin_traps_restore "$prev"
+  return "$rc"
 }
 
 # _effort_pin_apply_one <file> <name> <level> → rc 0 applied, 2 already at
@@ -71,7 +81,7 @@ _effort_pin_apply_one() {
     err "effort-pins: $file: write failed"; return 1
   fi
   if [ "$(_effort_pin_current "$file")" != "$level" ]; then
-    err "effort-pins: $file: level not applied (CRLF or malformed frontmatter?)"
+    err "effort-pins: $file: level not applied after write"
     return 1
   fi
   return 0
@@ -87,7 +97,7 @@ apply_effort_pins() {
     case "$name" in ''|'#'*) continue ;; esac
     if [ -n "$rest" ] || ! [[ "$name" =~ $EFFORT_PIN_NAME_RE ]] \
        || ! [[ "$level" =~ $EFFORT_PIN_LEVEL_RE ]]; then
-      err "effort-pins: rejected map line '$name $level $rest'"
+      err "effort-pins: rejected map line $(printf '%q' "$name $level $rest")"
       rejected=$((rejected + 1)); continue
     fi
     file="$repo/skills-external/$name/SKILL.md"

lib/tests/effort-pins.test.sh

@@ -16,7 +16,7 @@ check() { if [ "$2" = "$3" ]; then pass=$((pass+1)); echo "PASS $1"
 fm_effort() { awk 'NR==1&&/^---$/{p=1;next} p&&/^---$/{exit} p' "$1" \
   | sed -n 's/^effort: //p' | head -1; }
 
-WORK="$(mktemp -d)"; trap 'rm -rf "$WORK"' EXIT
+WORK="$(mktemp -d)" || exit 1; trap 'rm -rf "$WORK"' EXIT
 REPO="$WORK/repo"; EXT="$REPO/skills-external"
 mkdir -p "$REPO/lib" "$EXT/alpha" "$EXT/beta" "$EXT/gamma" "$EXT/noname"
 printf -- '---\nname: alpha\ndescription: a\n---\nbody\n' > "$EXT/alpha/SKILL.md"
@@ -77,15 +77,53 @@ mkrepo h13 crlf
 printf -- '---\r\nname: crlf\r\n---\r\nbody\r\n' > "$WORK/h13/skills-external/crlf/SKILL.md"
 printf 'crlf high\n' > "$WORK/h13/lib/effort-pins.txt"
 out="$(bash "$LIB" "$WORK/h13" 2>&1)"; rc=$?
-check T13-crlf-not-counted-applied \
+check T13-crlf-file-rejected \
   "$rc|$(printf '%s' "$out" | grep -c 'ERR ')|$(printf '%s' "$out" | grep -c ' 0 applied, ')" "1|1|1"
 
+# T13b: the post-write re-read branch, reached with a no-op write stub
+mkrepo h13b nowrite; f13b="$WORK/h13b/skills-external/nowrite/SKILL.md"
+printf -- '---\nname: nowrite\n---\nb\n' > "$f13b"
+out="$(bash -c 'source "$1"; _effort_pin_write() { return 0; }
+  _effort_pin_apply_one "$2" nowrite high' _ "$LIB" "$f13b" 2>&1)"; rc=$?
+check T13b-reread-mismatch-fails \
+  "$rc|$(printf '%s' "$out" | grep -c 'level not applied after write')" "1|1"
+
+if [ "${EFFORT_PINS_TEST_FAKE_ROOT:-0}" = 1 ] || [ "$(id -u)" -eq 0 ]; then
+  echo "SKIP T14-write-failure-no-temp: chmod bits ignored as root"
+else
   mkrepo h14 ro; d14="$WORK/h14/skills-external/ro"
   printf -- '---\nname: ro\n---\nb\n' > "$d14/SKILL.md"
   printf 'ro high\n' > "$WORK/h14/lib/effort-pins.txt"
   chmod 555 "$d14"; out="$(bash "$LIB" "$WORK/h14" 2>&1)"; rc=$?; chmod 755 "$d14"
   check T14-write-failure-no-temp \
     "$rc|$(printf '%s' "$out" | grep -c 'ERR ')|$(find "$d14" -name 'SKILL.md.*' | wc -l)" "1|1|0"
+fi
+
+# T15: SIGINT during the awk write removes the temp sibling, exit 130
+mkrepo h15 sig; d15="$WORK/h15/skills-external/sig"
+printf -- '---\nname: sig\n---\nb\n' > "$d15/SKILL.md"
+bash -c 'source "$1"; awk() { kill -INT $$; sleep 2; }
+  _effort_pin_write "$2" sig high' _ "$LIB" "$d15/SKILL.md" >/dev/null 2>&1
+rc=$?
+check T15-sigint-removes-temp \
+  "$rc|$(find "$d15" -name 'SKILL.md.*' | wc -l)" "130|0"
+
+# T15b: previous INT trap restored on a normal return, no EXIT trap set
+mkrepo h15b tr; d15b="$WORK/h15b/skills-external/tr"
+printf -- '---\nname: tr\n---\nb\n' > "$d15b/SKILL.md"
+out="$(bash -c 'source "$1"; trap "echo prev" INT
+  _effort_pin_write "$2" tr high
+  printf "INT:%s\n" "$(trap -p INT)"; printf "EXIT:%s\n" "$(trap -p EXIT)"' \
+  _ "$LIB" "$d15b/SKILL.md" 2>&1)"
+check T15b-traps-restored \
+  "$(printf '%s' "$out" | grep -c "^INT:trap -- 'echo prev' SIGINT")|$(printf '%s' "$out" | grep -c '^EXIT:$')" "1|1"
+
+# T16: a literal backslash-t in a map line is printed shell-quoted
+mkrepo h16 q
+printf 'bad\\tname high\n' > "$WORK/h16/lib/effort-pins.txt"
+out="$(bash "$LIB" "$WORK/h16" 2>&1)"; rc=$?
+check T16-rejected-line-quoted \
+  "$rc|$(printf '%s' "$out" | grep -cF 'bad\\tname')" "1|1"
 
 echo "effort-pins: $pass pass, $fail fail"
 [ "$fail" -eq 0 ]