docs: the skill and the README caught up with 0.7.0

Three published documents went out with 0.7.0 unread.

SKILL.md told a reader what a SKIP FINDING means and stopped there.
Complete before 0.7.0, not now: a repo can headline `OK · 3 not
checked`, and a session reporting the status word alone would report a
green pass over three unjudged findings. Status and count are now
required together. Shipping without this made the plugin whose purpose
is catching stale published documents ship one.

README's example output cited commits older than the behaviour they
demonstrate — 5884a64 (0.6.0) beside a `notChecked` that did not exist
in it, and a7276e6 two releases back. The version names a file; only the
sha names the code. Both now cite 10ad125.

README also now states the unit: `notChecked` counts un-judged FINDINGS,
not checks. portfolio-optimiser's `11 not checked` is almost entirely
LINK-OUTSIDE-REPO, so the bare number reads worse than the repo is. Named
as a known limitation, not corrected in the string — the fix is splitting
"deliberately not judged" from "could not run", which is the next release.

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "repo-standard",
-  "version": "0.7.0",
+  "version": "0.7.1",
   "description": "Per-repo gate for the open/ presentation standard: README first screen, install block, files required by the repo's class, and dead repo references.",
   "author": {
     "name": "Kjell Tore Guttormsen"