diff --git a/TASK.md b/TASK.md
index cb2bf31..c450007 100644
--- a/TASK.md
+++ b/TASK.md
@@ -1,14 +1,16 @@
-# Task 06G4JX6MSQEP7N0D5JWW9EP5X4
+# Task 06G4M6HF1Z3EREX1X3NEKSHP24
 
-Late handoff rig: add a --version line to the healthcheck usage text
+Name the healthcheck success message once
 
 - Project: test-e2e
-- Source: burnin/late-handoff-1
+- Source: burnin/run14-a
 - Priority: 0
 
 ## Instructions
 
-Add the version string to the usage text printed by scripts/orchestra_e2e_healthcheck.sh --help. Keep every existing line and exit status unchanged, and keep scripts/test_healthcheck.sh passing.
+scripts/orchestra_e2e_healthcheck.sh spells its success message inline. Give it a single named constant beside the existing VERSION constant and use that constant everywhere the message is printed.
+
+Behaviour must not change. The plain run, --quiet and --help keep their current output and exit statuses, and scripts/test_healthcheck.sh keeps passing.
 
 ## Research first
 
diff --git a/scripts/orchestra_e2e_healthcheck.sh b/scripts/orchestra_e2e_healthcheck.sh
index f7b9a38..f6fa7ee 100755
--- a/scripts/orchestra_e2e_healthcheck.sh
+++ b/scripts/orchestra_e2e_healthcheck.sh
@@ -1,6 +1,68 @@
 #!/usr/bin/env bash
 
 readonly VERSION=1.0.0
+readonly SUCCESS_MESSAGE='OK - all healthchecks passed'
+readonly ROOT=$(cd "$(dirname "$0")/.." && pwd)
+
+# Space-separated check names; each has a check_<name> function.
+CHECKS="repo_root_readable scripts_dir_present healthcheck_executable_bit
+selftest_present test_healthcheck_present readme_present
+no_crlf_line_endings no_tabs_in_scripts
+shebang_is_bash usage_text_mentions_every_flag"
+
+# name=ok / name=fail pairs, in run order.
+RESULTS=
+FAILED=0
+TOTAL=0
+
+# record <name> <status>: append one outcome to the results state.
+record() {
+  RESULTS="$RESULTS $1=$2"
+  TOTAL=$((TOTAL + 1))
+  [ "$2" = ok ] || FAILED=$((FAILED + 1))
+}
+
+check_repo_root_readable() { [ -d "$ROOT" ] && [ -r "$ROOT" ]; }
+check_scripts_dir_present() { [ -d "$ROOT/scripts" ]; }
+check_healthcheck_executable_bit() { [ -x "$ROOT/scripts/orchestra_e2e_healthcheck.sh" ]; }
+check_selftest_present() { [ -f "$ROOT/scripts/orchestra_e2e_selftest.sh" ]; }
+check_test_healthcheck_present() { [ -f "$ROOT/scripts/test_healthcheck.sh" ]; }
+check_readme_present() { [ -f "$ROOT/README.md" ]; }
+
+check_no_crlf_line_endings() {
+  [ -d "$ROOT/scripts" ] || return 1
+  ! grep -qU $'\r' "$ROOT"/scripts/*.sh "$ROOT/README.md" 2>/dev/null
+}
+
+check_no_tabs_in_scripts() {
+  [ -d "$ROOT/scripts" ] || return 1
+  ! grep -q "$(printf '\t')" "$ROOT"/scripts/*.sh 2>/dev/null
+}
+
+check_shebang_is_bash() {
+  [ -d "$ROOT/scripts" ] || return 1
+  local f
+  for f in "$ROOT"/scripts/*.sh; do
+    [ "$(head -n 1 "$f")" = '#!/usr/bin/env bash' ] || return 1
+  done
+}
+
+check_usage_text_mentions_every_flag() {
+  local text flag
+  text=$(usage text)
+  for flag in --quiet --json --help; do
+    case "$text" in
+      *"$flag"*) ;;
+      *) return 1 ;;
+    esac
+  done
+}
+
+# now_us: current time in microseconds. Strips any locale decimal separator.
+now_us() { printf '%s' "${EPOCHREALTIME//[!0-9]/}"; }
+
+# elapsed_ms <start-us>: whole milliseconds since <start-us>.
+elapsed_ms() { printf '%s' "$(( ($(now_us) - $1) / 1000 ))"; }
 
 # emit <format> <template> [args...]: the single output path.
 # format: text or json print; none suppresses (--quiet). Explicit argument,
@@ -11,21 +73,72 @@ emit() {
   [ "$format" = none ] || printf "$@"
 }
 
+# usage <format>: the --help body. Also the source check_usage_text_mentions_every_flag
+# reads, so the flag list has exactly one home.
+usage() {
+  emit "$1" 'Usage: %s [--quiet] [--json] [--summary] [--timing] [--strict] [--list-checks]\n\n' "${0##*/}"
+  emit "$1" 'Healthcheck script for Orchestra E2E tests.\n'
+  emit "$1" 'Exits 0 with a success message if all checks pass.\n'
+  emit "$1" '  --quiet  Suppress the success message; still exits 0.\n'
+  emit "$1" '  --json   Print a single-line JSON result; still exits 0.\n'
+  emit "$1" '  --help   Print this usage text and exit 0.\n'
+  emit "$1" '  --summary  Print one line per check before the success message.\n'
+  emit "$1" '  --timing Print elapsed milliseconds for the run.\n'
+  emit "$1" '  --strict Reject an unrecognised flag: exits 2.\n'
+  emit "$1" '  --list-checks  Print the name of each check; exits 0.\n'
+  emit "$1" '\nChecks:\n'
+  local name
+  for name in $CHECKS; do
+    emit "$1" '  %s\n' "$name"
+  done
+  emit "$1" '\nVersion: %s\n' "$VERSION"
+}
+
 main() {
+  local start_us
+  start_us=$(now_us)
   local quiet=
   local json=
+  local summary=
+  local timing=
+  local strict=
+  local unknown=
   for arg in "$@"; do
     if [ "$arg" = --help ]; then
-      emit text 'Usage: %s [--quiet]\n\n' "${0##*/}"
-      emit text 'Healthcheck script for Orchestra E2E tests.\n'
-      emit text 'Exits 0 with a success message if all checks pass.\n'
-      emit text '  --quiet  Suppress the success message; still exits 0.\n'
-      emit text 'Version: %s\n' "$VERSION"
+      usage text
+      exit 0
+    elif [ "$arg" = --list-checks ]; then
+      local listed
+      for listed in $CHECKS; do
+        emit text '%s\n' "$listed"
+      done
       exit 0
     elif [ "$arg" = --quiet ]; then
       quiet=1
     elif [ "$arg" = --json ]; then
       json=1
+    elif [ "$arg" = --summary ]; then
+      summary=1
+    elif [ "$arg" = --timing ]; then
+      timing=1
+    elif [ "$arg" = --strict ]; then
+      strict=1
+    else
+      [ -n "$unknown" ] || unknown=$arg
+    fi
+  done
+
+  if [ -n "$strict" ] && [ -n "$unknown" ]; then
+    printf 'unknown flag: %s\n' "$unknown" >&2
+    exit 2
+  fi
+
+  local name
+  for name in $CHECKS; do
+    if "check_$name"; then
+      record "$name" ok
+    else
+      record "$name" fail
     fi
   done
 
@@ -33,12 +146,36 @@ main() {
   [ -n "$quiet" ] && format=none
   [ -n "$json" ] && format=json
 
+  if [ "$FAILED" -gt 0 ]; then
+    local entry
+    for entry in $RESULTS; do
+      [ "${entry#*=}" = fail ] && emit "$format" 'FAIL - %s\n' "${entry%=*}"
+    done
+    exit 1
+  fi
+
+  local elapsed
+  elapsed=$(elapsed_ms "$start_us")
+
   if [ "$format" = json ]; then
-    emit "$format" '{"status":"ok","checks":1}\n'
+    local timings=
+    [ -n "$timing" ] && timings=",\"timings\":{\"healthchecks\":$elapsed}"
+    emit "$format" '{"status":"ok","checks":%d%s}\n' "$TOTAL" "$timings"
     exit 0
   fi
 
-  emit "$format" 'OK - all healthchecks passed\n'
+  if [ -n "$summary" ]; then
+    local entry
+    for entry in $RESULTS; do
+      emit "$format" '%s: %s\n' "${entry%=*}" "${entry#*=}"
+    done
+  fi
+
+  if [ -n "$timing" ]; then
+    emit "$format" 'healthchecks: %sms\n' "$elapsed"
+  fi
+
+  emit "$format" '%s\n' "$SUCCESS_MESSAGE"
   exit 0
 }
 
diff --git a/scripts/orchestra_e2e_selftest.sh b/scripts/orchestra_e2e_selftest.sh
index f99d410..dedf463 100755
--- a/scripts/orchestra_e2e_selftest.sh
+++ b/scripts/orchestra_e2e_selftest.sh
@@ -34,4 +34,16 @@ case "$jout" in
   *) fail '--json run stdout prefix: want {"status":' "$jout" ;;
 esac
 
+# --strict rejects an unknown flag
+sout=$(bash "$healthcheck" --strict --nonsense 2>&1)
+sstatus=$?
+
+[ "$sstatus" -eq 2 ] || fail "--strict --nonsense exit status: want 2, got $sstatus" "$sout"
+
+# --strict alone is accepted
+gout=$(bash "$healthcheck" --strict)
+gstatus=$?
+
+[ "$gstatus" -eq 0 ] || fail "--strict run exit status: want 0, got $gstatus" "$gout"
+
 printf 'selftest: ok\n'
diff --git a/scripts/test_healthcheck.sh b/scripts/test_healthcheck.sh
index 71193f9..3b7cfea 100755
--- a/scripts/test_healthcheck.sh
+++ b/scripts/test_healthcheck.sh
@@ -3,7 +3,11 @@
 
 HC="$(dirname "$0")/orchestra_e2e_healthcheck.sh"
 OK='OK - all healthchecks passed'
-USAGE="$(printf 'Usage: orchestra_e2e_healthcheck.sh [--quiet]\n\nHealthcheck script for Orchestra E2E tests.\nExits 0 with a success message if all checks pass.\n  --quiet  Suppress the success message; still exits 0.\nVersion: 1.0.0')"
+NAMES='repo_root_readable scripts_dir_present healthcheck_executable_bit
+selftest_present test_healthcheck_present readme_present
+no_crlf_line_endings no_tabs_in_scripts
+shebang_is_bash usage_text_mentions_every_flag'
+USAGE="$(printf 'Usage: orchestra_e2e_healthcheck.sh [--quiet] [--json] [--summary] [--timing] [--strict] [--list-checks]\n\nHealthcheck script for Orchestra E2E tests.\nExits 0 with a success message if all checks pass.\n  --quiet  Suppress the success message; still exits 0.\n  --json   Print a single-line JSON result; still exits 0.\n  --help   Print this usage text and exit 0.\n  --summary  Print one line per check before the success message.\n  --timing Print elapsed milliseconds for the run.\n  --strict Reject an unrecognised flag: exits 2.\n  --list-checks  Print the name of each check; exits 0.\n\nChecks:\n  repo_root_readable\n  scripts_dir_present\n  healthcheck_executable_bit\n  selftest_present\n  test_healthcheck_present\n  readme_present\n  no_crlf_line_endings\n  no_tabs_in_scripts\n  shebang_is_bash\n  usage_text_mentions_every_flag\n\nVersion: 1.0.0')"
 fails=0
 
 check() { # check <expected-stdout> <label> [args...]
@@ -17,6 +21,18 @@ check() { # check <expected-stdout> <label> [args...]
   fi
 }
 
+contains() { # contains <needle> <label> [args...]
+  local want=$1 label=$2 got status
+  shift 2
+  got=$(bash "$HC" "$@" 2>/dev/null)
+  status=$?
+  if [ "$status" -ne 0 ] || [ "${got#*"$want"}" = "$got" ]; then
+    printf 'FAIL: %s (exit=%s)\n---missing---\n%s\n---in---\n%s\n' \
+      "$label" "$status" "$want" "$got"
+    fails=$((fails + 1))
+  fi
+}
+
 check "$OK" 'no args'
 check '' '--quiet' --quiet
 check "$USAGE" '--help' --help
@@ -24,5 +40,55 @@ check "$USAGE" '--help --quiet' --help --quiet
 check "$USAGE" '--quiet --help' --quiet --help
 check "$OK" 'unknown flag ignored' --bogus
 
+for name in $NAMES; do
+  contains "$name" "--help names $name" --help
+done
+
+# All ten names in one run's output.
+help_out=$(bash "$HC" --help 2>/dev/null)
+missing=
+for name in $NAMES; do
+  [ "${help_out#*"$name"}" = "$help_out" ] && missing="$missing $name"
+done
+if [ -n "$missing" ]; then
+  printf 'FAIL: --help lists all ten check names\n---missing---\n%s\n' "$missing"
+  fails=$((fails + 1))
+fi
+
+# --list-checks prints one name per line and nothing else.
+listed=$(bash "$HC" --list-checks 2>/dev/null)
+want_listed=$(printf '%s\n' $NAMES)
+if [ "$listed" != "$want_listed" ]; then
+  printf 'FAIL: --list-checks\n---got---\n%s\n---want---\n%s\n' "$listed" "$want_listed"
+  fails=$((fails + 1))
+fi
+
+# --summary prints one name: outcome line per check, then the success line.
+summary_out=$(bash "$HC" --summary 2>/dev/null)
+for name in $NAMES; do
+  case "$summary_out" in
+    *"$name: ok"*) ;;
+    *) printf 'FAIL: --summary omits %s\n' "$name"; fails=$((fails + 1)) ;;
+  esac
+done
+case "$summary_out" in
+  *"$OK") ;;
+  *) printf 'FAIL: --summary does not end with the success line\n'; fails=$((fails + 1)) ;;
+esac
+
+# --timing prints an elapsed line, and composes with --json and --quiet.
+contains 'healthchecks:' '--timing' --timing
+contains '"timings":{"healthchecks":' '--timing --json' --timing --json
+check '' '--timing --quiet' --timing --quiet
+
+# --strict rejects an unrecognised flag; on its own it changes nothing.
+strict_out=$(bash "$HC" --strict --nonsense 2>&1)
+strict_status=$?
+if [ "$strict_status" -ne 2 ] || [ "${strict_out#*unknown flag}" = "$strict_out" ]; then
+  printf 'FAIL: --strict --nonsense (exit=%s)\n---got---\n%s\n' "$strict_status" "$strict_out"
+  fails=$((fails + 1))
+fi
+check "$OK" '--strict alone' --strict
+
 [ "$fails" -eq 0 ] || exit 1
 printf 'all checks passed\n'