step 4/4: the docs say permissions too, and capability means one thing again

44 files of prose — CLAUDE.md, AGENTS.md, TODO.md, 20 docs, both plugin design
documents, and the comment surface the earlier steps could not reach.

Applied against an explicit keep-list, not swept, because the word turned out to
have SIX meanings in this repository rather than the three the offscale doc
recorded:

  permissions          renamed (steps 1–2)
  $OFFICER_ROOT/capabilities/  KEPT — the item store, and now the only thing
                               the word means that is ours
  sidecar routing keys renamed to `handles` (step 3)
  Lightning wallet     KEPT — a domain term, and on the wire to the mobile apps
  terminfo queries     KEPT — XTGETTCAP, in the pty sidecar
  InvoiceShelf         KEPT — per-resource { write, bulkDelete } flags

The sweep still falsified two things, both caught by checking rather than by
review, and both in prose that discusses more than one meaning at once:

CLAUDE.md began claiming the item store lives at `$OFFICER_ROOT/permissions`.
It does not; that directory is on disk and full of skills and tools.

And the offscale doc's own note about the collision became
"Named `permissions`, NOT `permissions`" — a sentence that had eaten the thing
it existed to warn about.

Both restored, and the note rewritten to say what is now true: capability means
one thing of ours, and three that belong to somebody else's vocabulary.

Verified live after restart: self and admin permission endpoints 200, gated
route 200, agent-status 200, 9 grants intact with 6 permissions offered.
tsgo clean, 797 tests, 787 pass, same 7.

The rename is done. Four steps, no data lost, no client break that survived
the step it was introduced in.

docs/nextcloud-replacement.md

@@ -136,7 +136,7 @@ account manager in recoverable form, and synced to whatever backs that phone up.
 device, revocable per device, is the whole point.
 
 `user_id` was described here as "referential integrity, not multi-tenancy". That is no longer true:
-since 2026-08-07 `calendar` is a **grantable** capability, so an app password can belong to a member
+since 2026-08-07 `calendar` is a **grantable** permission, so an app password can belong to a member
 and the column decides whose collection tree Radicale serves. It is load-bearing.
 
 ---