fix(lint): make the Vale prefilter work for external consumers

pre-commit prefixes only entry[0] with the hook-repo clone path
(cmd = (prefix.path(cmd[0]), *cmd[1:])), so the --config argument in
.pre-commit-hooks.yaml resolved against the *consuming* repo's root
and hard-failed every external run with E100. Two of the three hooks
ADR-0014 promises were unusable.

vale-wrap.sh now self-locates its config from BASH_SOURCE when no
--config is supplied; an explicit --config still wins in all three
argv forms and stays cwd-relative. Both manifests drop the argument
and are kept byte-identical: the local repo: local config resolved
--config correctly only because the consuming repo *was* this repo,
and that divergence is why three review rounds missed the defect.

Also in the wrapper:
- replace GNU-only `realpath -m` with a portable abspath helper; -m is
  load-bearing (dest does not exist yet), so BSD realpath aborted the
  script under set -e on macOS
- walk directory arguments instead of passing them through unflattened,
  which reported a clean 0-error run for files that fail when named
  explicitly
- read/write with errors='surrogateescape' so one non-UTF-8 .md under a
  directory argument cannot abort the hook

New test-vale-hooks-consumer.sh builds the hook repo from the working
tree and points a file:// consumer at it, covering the manifest as a
hook repo for the first time.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MCQ648fLSFXPHGZdQ8gn58

tests/run-tests.sh

@@ -2,6 +2,9 @@
 # Run all test-*.sh files in the repo (including plugins) and the bats suite.
 # Usage: bash tests/run-tests.sh [--bats-only]
 #
+# A script exiting 77 (the automake convention) is reported as SKIPPED, not
+# passed — a suite that can't run for lack of a binary must not read as green.
+#
 # TEST_DIR — override root to search for test-*.sh (default: REPO_ROOT); used by tests.
 set -euo pipefail
 
@@ -13,7 +16,9 @@ BATS_ONLY=false
 SEARCH_ROOT="${TEST_DIR:-$REPO_ROOT}"
 
 FAILED=()
+SKIPPED=()
 PASSED=0
+SKIP_EXIT=77
 
 run_bats() {
   if [[ -x "$BATS" ]]; then
@@ -40,15 +45,25 @@ mapfile -t SCRIPTS < <(
 for script in "${SCRIPTS[@]}"; do
   rel="${script#"$SEARCH_ROOT/"}"
   echo "=== $rel ==="
-  if bash "$script"; then
+  rc=0
+  bash "$script" || rc=$?
+  if [[ $rc -eq 0 ]]; then
     PASSED=$((PASSED + 1))
+  elif [[ $rc -eq $SKIP_EXIT ]]; then
+    SKIPPED+=("$rel")
   else
     FAILED+=("$rel")
   fi
   echo ""
 done
 
-echo "=== Summary: $PASSED passed, ${#FAILED[@]} failed ==="
+echo "=== Summary: $PASSED passed, ${#SKIPPED[@]} skipped, ${#FAILED[@]} failed ==="
+if [[ ${#SKIPPED[@]} -gt 0 ]]; then
+  echo "Skipped scripts:"
+  for s in "${SKIPPED[@]}"; do
+    echo "  $s"
+  done
+fi
 if [[ ${#FAILED[@]} -gt 0 ]]; then
   echo "Failed scripts:"
   for s in "${FAILED[@]}"; do