feat(engine)!: a skip says which of the two things it is

`notChecked` merged "deliberately not judged" with "could not run". 0.7.0 took
SKIP out of the severity lattice, which fixed "clean repos look skipped"; this
fixes the same defect one level down, where it was saying so more quietly.
Measured across 19 clones, 35 of 39 skips are deliberate — so
`portfolio-optimiser — OK · 11 not checked` announced eleven unread checks when
all eleven were fixture and out-of-repo links.

Every SKIP finding now carries `skip: 'byDesign' | 'notRun'`, set at the
emission site rather than looked up from its code: VERSION-TAG is emitted at
SKIP with no tags and at ERROR with the wrong one, so a code→kind map has to
re-derive a reason the emitter already had. Untagged falls to `notRun`, the
loud side. Results carry `skips: { byDesign, notRun }`; `notChecked` stays a
number and stays the total, because a consumer doing `notChecked > 0` against
an object gets a silent false.

The summary line names only `notRun` — the deliberate ones keep their own
`NOT JUDGED` heading in the detail output. Landing the split in `--json` alone
would have left the symptom exactly where it was.

VERSION-UNAVAILABLE stays `notRun` by decision, not by default: it is arguably
"no subject to judge", the shape checkReadmeLanguage answers with OK, but
re-levelling it moves a repo's status and is a second behaviour change.

Verified: 169 tests. 19 clones swept with both engines offline — 220 judged
findings, every status, notChecked and buckets identical, no finding differing
beyond the new tag. The exhaustiveness test scans the engine SOURCE, not a
finding set: a corpus test only sees the sites it triggers, and the next
emission site added would take the reader's default invisibly.

BREAKING CHANGE: the summary line's coverage qualifier reads `· N not run` and
counts only un-runnable skips, where it read `· N not checked` over all of
them. `--json` gains `skips`; `notChecked` is unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DHaQTcaD3w2C6PqVsAmrcv

package.json

@@ -1,6 +1,6 @@
 {
   "name": "repo-standard",
-  "version": "0.7.1",
+  "version": "0.8.0",
   "private": true,
   "type": "module",
   "engines": {