docs(60): point-of-use corrections from the 2026-10-20 review

Measured fixes, one line each, from the review of everything that landed on
2026-10-20 (issue #60). Each page keeps its own facts; nothing was moved.

- inventory/index, index: the census blurb says what the page actually covers
  (tracked-vs-box-only per file), not "all userspace configuration"
- dotfiles-deploy: the wallpaper re-fetch recipe resolves the CDN URL through
  the wallhaven API — /w/<id> answers text/html, so curl -L never yields a
  JPEG; description widened to the whole page, tools/index blurb matched
- okf-maintenance: the link example and the mistake bullet now agree with
  okf-spec, which RECOMMENDS absolute bundle paths (they said the opposite)
- decisions/index: the unlisted-page gate is kb-coverage.py, not kb-lint
- AGENTS.md: the three skill-config subsections are pointers again; the pages
  own issue tracker, labels and domain docs
- swayidle-lock.service: Description names what the unit does (arms the idle
  lock over noctalia-shell IPC); suspend belongs to noctalia's inhibitor
- common.pkgs: git-lfs re-justified by the tracked .gitattributes filter
  contract; the swayidle comment drops its lid-policy claim

omp-docs/decisions/index.md

@@ -1,8 +1,8 @@
 # Architecture decision records
 
 Decisions this repo has made and will not silently revisit. One file per
-decision, named `NNN-<slug>.md`, listed here — an unlisted page fails `kb-lint`
-and does not exist as far as any agent is concerned.
+decision, named `NNN-<slug>.md`, listed here — an unlisted page fails
+`scripts/kb-coverage.py` and does not exist as far as any agent is concerned.
 
 **No ADRs yet.** The first one lands the moment a decision stops being
 reversible.