fix(lint): resolve round-1 and round-2 review findings on the Vale prefilter

Addresses PR #85's outstanding review items after grilling the open
questions against ADR-0013/CONTEXT.md/ADR-0010:

Blocking fixes:
- vale-wrap.sh: replace json.dumps() escaping (which silently defeated
  Vale's frontmatter scope on any description containing a quote,
  backslash, or non-ASCII char — ~58% of the corpus) with a single-quoted
  YAML scalar, substituting a Unicode right single quote for embedded
  apostrophes rather than '' doubling (Vale's frontmatter scanner isn't a
  full YAML parser and silently truncates on '' too).
- vale-wrap.sh: fix a blank-line-inside-a-folded-description truncation
  bug via indentation-based, blank-line-tolerant body capture; narrow
  flattening to `>`-style scalars only (`|` already works unflattened).
- skill-audit/agent-audit Step 1: make the vale-wrap.sh invocation
  cwd-independent via git rev-parse --show-toplevel, fixing a bug where
  no single cwd satisfied all three Step 1 commands.
- styles/Kyberforge/VagueQualifier.yml: prune 17 tokens verified
  false-positive-dominated on this repo's own voice via a real corpus
  sweep (obvious, clearly, usually, several, simple, easy, completely,
  simply, tiny, etc.), keep 13 with real or unattested noise. Revert the
  28 prose "fixes" those tokens drove across 14 skill files back to their
  original, correct wording, including a functional regression to
  caveman/SKILL.md's own filler-word list (a mention, not a use) — now
  guarded with vale-off comments against recurrence.

Gaps:
- --minAlertLevel=warning on the pre-commit hook and Step 1 invocation
  so warning-level rules actually surface, without collapsing the
  FAIL/SUGGESTION severity mapping skill-audit/agent-audit rely on.
- vale-wrap.sh: fix --config=<path> equals-form, absolute-path silent
  no-op, and a zero-file-argument stdin hang.
- Route vale-run and lint-runner through a documented wrapper script
  when a target repo has one, instead of unconditionally recommending
  bare `vale`.
- Wire Kyberforge.VagueQualifier/SentenceOpenerThereIs into skill-audit/
  agent-audit's dimension-mapping prose (Body discipline).
- Add plugins/lint/sources.md provenance for lint-runner (ADR-0010).
- Sync both marketplace.json lint-entry descriptions with plugin.json.
- Retune skill-size-check.sh's MAX_WORDS 5000->2900 (measured ~1.6-1.7
  tokens/word on this repo's corpus, the old value gated at ~8,500
  tokens against a stated 5,000 ceiling); fix the >/>= line-count
  boundary and wc -l undercount on files with no trailing newline.
- Document the vale binary as a Setup prerequisite in AGENTS.md.
- Fix SentenceOpenerThereIs's dead regex alternative and add a real
  sentence-start anchor/scope.
- Fix a stale docs/research/docs/vale/ index pointer in kyberforge's
  docs README (moved to plugins/lint/ in e1a5403).
- Rewrite ADR-0013's Consequences section past-tense to describe what
  actually landed, and record the styles-portability limitation
  (repo-root placement stays intentional; deferred to a separate
  session per this PR's review).

Test coverage: 9 new vale-wrap.sh fixtures (quotes, backslash/unicode,
blank-line paragraphs, --config= form, zero-arg/absolute-path handling,
literal-block no-regression) and boundary-pair tests for
skill-size-check.sh's line/word ceilings.

bash tests/run-tests.sh: 9 scripts + 125 bats assertions, all passing.
scripts/check-manifests.sh and claude plugin validate --strict: clean.

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

tests/test-skill-size-check.sh

@@ -60,6 +60,102 @@ else
   pass "file over the 5,000-word ceiling exits non-zero"
 fi
 
+# Boundary-pair tests below read the script's current MAX_WORDS rather than
+# hardcoding it, so they don't silently drift if the threshold changes again.
+MAX_WORDS="$(grep -oE '^MAX_WORDS=[0-9]+' "$SCRIPT" | cut -d= -f2)"
+MAX_LINES="$(grep -oE '^MAX_LINES=[0-9]+' "$SCRIPT" | cut -d= -f2)"
+
+# make_line_fixture builds a file with an exact total line count (frontmatter
+# included), independent of word count, for the line-boundary tests.
+make_line_fixture() {
+  local name="$1" total_lines="$2" file body_lines
+  file="$TMPDIR/$name.md"
+  {
+    echo "---"
+    echo "name: $name"
+    echo "description: Test fixture."
+    echo "---"
+  } > "$file"
+  body_lines=$((total_lines - 4))
+  for ((i = 1; i <= body_lines; i++)); do
+    echo "word"
+  done >> "$file"
+  echo "$file"
+}
+
+# The line ceiling is exclusive of the limit itself ("stay under $MAX_LINES
+# lines", per skill-authoring.md), enforced via `>=` — so $((MAX_LINES - 1))
+# must pass and $MAX_LINES itself must already fail.
+echo ""
+echo "--- passes a file at $((MAX_LINES - 1)) lines, just under the $MAX_LINES-line boundary ---"
+AT_LINES="$(make_line_fixture at-line-limit "$((MAX_LINES - 1))")"
+ACTUAL_LINES=$(awk 'END{print NR}' "$AT_LINES")
+if [[ "$ACTUAL_LINES" -ne "$((MAX_LINES - 1))" ]]; then
+  fail "fixture has $ACTUAL_LINES lines, expected exactly $((MAX_LINES - 1))"
+elif "$SCRIPT" "$AT_LINES"; then
+  pass "file at $((MAX_LINES - 1)) lines exits 0"
+else
+  fail "file at $((MAX_LINES - 1)) lines should have exited 0"
+fi
+
+echo ""
+echo "--- fails a file at exactly the $MAX_LINES-line boundary ---"
+OVER_LINES="$(make_line_fixture over-line-limit "$MAX_LINES")"
+ACTUAL_OVER_LINES=$(awk 'END{print NR}' "$OVER_LINES")
+if [[ "$ACTUAL_OVER_LINES" -ne "$MAX_LINES" ]]; then
+  fail "fixture has $ACTUAL_OVER_LINES lines, expected exactly $MAX_LINES"
+elif "$SCRIPT" "$OVER_LINES" 2>/dev/null; then
+  fail "file at exactly $MAX_LINES lines should have exited non-zero (>= ceiling, the boundary bug this test guards against)"
+else
+  pass "file at exactly $MAX_LINES lines exits non-zero"
+fi
+
+# make_word_fixture builds a file with an exact total word count (frontmatter
+# words included, since the script's `wc -w` counts the whole file) by padding
+# a body line with just enough "word" tokens to close the gap to the target.
+make_word_fixture() {
+  local name="$1" target="$2" file cur remaining body
+  file="$TMPDIR/$name.md"
+  {
+    echo "---"
+    echo "name: $name"
+    echo "description: Test fixture."
+    echo "---"
+  } > "$file"
+  cur=$(wc -w < "$file")
+  remaining=$((target - cur))
+  body=""
+  for ((i = 1; i <= remaining; i++)); do
+    body="$body word"
+  done
+  echo "$body" >> "$file"
+  echo "$file"
+}
+
+echo ""
+echo "--- passes a file at exactly the $MAX_WORDS-word boundary ---"
+AT_WORDS="$(make_word_fixture at-word-limit "$MAX_WORDS")"
+ACTUAL_WORDS=$(wc -w < "$AT_WORDS")
+if [[ "$ACTUAL_WORDS" -ne "$MAX_WORDS" ]]; then
+  fail "fixture has $ACTUAL_WORDS words, expected exactly $MAX_WORDS"
+elif "$SCRIPT" "$AT_WORDS"; then
+  pass "file at exactly $MAX_WORDS words exits 0"
+else
+  fail "file at exactly $MAX_WORDS words should have exited 0"
+fi
+
+echo ""
+echo "--- fails a file one word over the $MAX_WORDS-word boundary ---"
+OVER_WORDS="$(make_word_fixture over-word-limit "$((MAX_WORDS + 1))")"
+ACTUAL_OVER_WORDS=$(wc -w < "$OVER_WORDS")
+if [[ "$ACTUAL_OVER_WORDS" -ne "$((MAX_WORDS + 1))" ]]; then
+  fail "fixture has $ACTUAL_OVER_WORDS words, expected exactly $((MAX_WORDS + 1))"
+elif "$SCRIPT" "$OVER_WORDS" 2>/dev/null; then
+  fail "file at $((MAX_WORDS + 1)) words should have exited non-zero"
+else
+  pass "file at $((MAX_WORDS + 1)) words exits non-zero"
+fi
+
 echo ""
 echo "Results: $PASS passed, $FAIL failed"
 [[ $FAIL -eq 0 ]]