fix(lint): make the Vale gate actually gate, drop VagueQualifier

Round-3 review of PR #85 found the "enforcing" pre-commit hook enforced
nothing. Vale's exit code keys on error-level alerts alone: five of the
six rules were level: warning, so they exited 0, and pre-commit hides
output from a passing hook — the alerts were invisible and blocked
nothing. ADR-0013 rejected a report-only trial tier and then shipped one
by accident.

Flatten every rule to level: error. Vale's own exit code is then correct,
so the hook entry drops to a bare vale-wrap.sh call and the graded
error->FAIL / warning->SUGGESTION mapping disappears from both audit
skills: every alert is a FAIL, in the gate and the audit alike. No
ignorable tier, matching shellcheck, the test suite and
conventional-pre-commit.

Delete Kyberforge.VagueQualifier. Measured against the 41 skill/agent
files as they stood before the rule ever ran: 2 hits. One marginal
("very different" -> "fundamentally different"), one an unfixable false
positive — caveman/SKILL.md quotes "of course" as an example of filler,
a mention not a use — which forced the only Vale suppression comments in
the repo. Those four lines go with it; two of them were dead anyway,
suppressing a frontmatter-scoped rule on a body line. Held-out prose (273
files) fired 15 times, 9 inside out-of-scope research examples and the
rest one word in two idioms in a single doc. SentenceOpenerThereIs
survives: 22 held-out hits, both in-corpus hits clean rewrites, zero
suppressions.

Widen .vale.ini's globs to [**/SKILL.md], [**/agents/*.md] and
[**/*.agent.md]. The plugins/*/-prefixed globs scoped nothing — Vale's *
crosses /, so they already matched docs/research/examples/**/agents/*.md
and assets/templates/SKILL.md, the two paths CONTEXT.md claimed they
excluded. Scoping is and was the hook's files: regex. The old globs also
hid a silent false negative: a skill outside plugins/ matched no section,
so Vale reported 0 files and exited 0, which both audits read as clean.
They now treat a 0-file run as NOT RUN and fall back to full judgment.

Also:
- vale-wrap.sh resolves relative --config values and file arguments
  against the caller's cwd, as vale does, instead of the repo root, which
  hard-errored from a subdirectory and silently skipped flattening for
  file args that did not resolve from the root. Absolute paths inside the
  cwd are relativized so reports cite resolvable paths, not scratch ones.
- vale-run's exit-code model was documented backwards ("exits non-zero
  whenever it finds an alert at or above MinAlertLevel") and would have
  led anyone following it to build a gate that passes everything. Its
  Markdown suppression syntax was MDX-only and does not suppress in .md;
  corrected in the skill and its troubleshooting reference, with
  backtick/fence exemption documented as the first resort.
- skill-size-check.sh fails only above 500 lines, agreeing with
  skill-audit's validate.sh <= 500 pass.
- ADR-0013 and CONTEXT.md amended to match, recording why graded
  severities cannot gate.

Verified: 9 test scripts / 15 vale-wrap cases pass; vale-audit-prefilter,
skill-size-check and shellcheck pass --all-files; check-manifests and
claude plugin validate --strict clean. New tests fail against the old
script (3 of them) and pass against the new one.

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

plugins/lint/skills/vale-run/references/troubleshooting.md

@@ -7,7 +7,14 @@ source_keys:
 
 ## Inline suppression syntax by format
 
-Markdown/MDX:
+Markdown uses HTML comments — the MDX `{/* */}` form does not suppress anything in a plain `.md` file:
+```markdown
+<!-- vale off -->
+This text will be ignored.
+<!-- vale on -->
+```
+
+MDX:
 ```mdx
 {/* vale off */}
 This text will be ignored.
@@ -25,6 +32,14 @@ This text will be ignored.
 
 Targets one rule and specific known-exception strings, then re-enables — the preferred fix for a recurring false positive on a specific term, since it keeps the rule active everywhere else:
 
+Markdown:
+```markdown
+<!-- vale Style.Redundancy["ACT test","OTHER"] = NO -->
+This is some text ACT test
+<!-- vale Style.Redundancy["ACT test","OTHER"] = YES -->
+```
+
+MDX:
 ```mdx
 {/* vale Style.Redundancy["ACT test","OTHER"] = NO */}
 This is some text ACT test
@@ -50,7 +65,7 @@ If a file's syntax-aware parsing produces noisy or incorrect results (an unsuppo
 
 ## CI failing unexpectedly
 
-If a CI job fails solely because Vale returns a non-zero exit code on found alerts — not because the content is actually wrong for that pipeline stage — add `--no-exit` rather than suppressing the rule itself. This preserves the lint output while not gating the build on it.
+Only `error`-level alerts make Vale exit non-zero; `warning` and `suggestion` alerts are printed but exit `0`. If a CI job fails solely because of `error`-level alerts — not because the content is actually wrong for that pipeline stage — add `--no-exit` rather than suppressing the rule itself. This preserves the lint output while not gating the build on it. If the alerts are warnings or suggestions, Vale did not fail the job — look elsewhere.
 
 ## pre-commit integration