chore: address Copilot review round 6

- verify-skills: the best-effort `plugin validate` hand-off now also requires
  the EXACT pinned CLI. `local:gate` runs `validate` before the pinned
  `verify:skills:cli` step, so a newer local CLI could reject skills that CI's
  pinned validator accepts — and the gate would exit there, never reaching the
  reproducible check. One schema everywhere, or none.
- Dropped `PLUGIN_VALIDATE_MIN_VERSION`: with both validators on the exact pin
  it was read only by its own test, and a constant nothing enforces is a claim
  nothing enforces. Its test now pins what actually matters — that equality is
  distinguishable from newer as well as older.
- The CI step's comment described the old floor behavior.
- issue-create: the duplicate check searched only open issues, so a completed or
  rejected match was invisible to a procedure that says never to duplicate.
  Searches all states and reports state/stateReason.

Signed-off-by: cliffhall <cliff@futurescale.com>

.claude/skills/issue-create/SKILL.md

@@ -33,9 +33,14 @@ item is a real GitHub issue.
 
 ## 0. Check the board first
 
+Search **all** states, not just open. A closed issue is still a duplicate — it
+may have been completed, rejected, or filed and superseded — and refiling it
+loses that history. When one matches, the call is whether to reopen it or file
+genuinely new work; either way you need to have seen it (Copilot).
+
 ```sh
-gh issue list --repo modelcontextprotocol/inspector --state open --limit 1000 \
-  --search "<keywords>" --json number,title,labels,milestone
+gh issue list --repo modelcontextprotocol/inspector --state all --limit 1000 \
+  --search "<keywords>" --json number,title,state,stateReason,labels,milestone
 ```
 
 ## 1. Pick the labels