docs(org): complete A5 living-docs sweep (item CRUD merged) + dead_code cleanup

Extends the A5 pre-stage now that dev-b's full B-stream (item CRUD + all 19
org subcommands) merged to main (7392795). Living docs:
- FORMATS/CRYPTO/SECURITY/DESIGN: flip the item-CRUD "pending Dev-B" markers to
  shipped; SECURITY audit vocabulary moves item-* actions to live.
- crates/relicario-cli/ARCHITECTURE.md: full 19-subcommand surface (12 admin +
  7 item CRUD), accurate OrgAddKind scope (Login/SecureNote/Identity).
- STATUS.md: enterprise-org-vault landed section (merged 7392795) + tracked
  follow-ups + honest known-limitations; correct spec citation.
- ROADMAP.md: backend-complete row + phase-2 follow-ups.
- CHANGELOG.md: finalize the enterprise-org-vault Unreleased section (item CRUD
  into Added; Card/Key/Document/Totp + extension + phase-2 into Deferred).

Code (PM-directed dead_code fixes): wire device::current_device_seed by removing
the identical duplicate private fn in org_session.rs (de-dup); #[allow(dead_code)]
+ justification on org_session org_meta_path/load_meta (API completeness, no
command consumes org.json yet). Also silence a 3rd pre-existing test-only warning
(unused relicario() helper in tests/org_init_signing.rs).

Honest deferrals kept explicit throughout: Card/Key/Document/Totp org add/edit
parity, extension org switch/read (Dev-D) + writes, phase-2 (SSO/LDAP, read
audit, per-collection subkeys, HTTP plane). Full workspace cargo test green,
zero warnings. All cited code constants pinned file:line.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TJo44YM3UbBjro2fG6NrKy

docs/SECURITY.md

@@ -154,13 +154,13 @@ the cryptographically verified signer.
 
 Actions live in two groups:
 
-- **Live (merged A + C streams):** `member-add`, `member-remove`,
+- **Membership / collections / lifecycle:** `member-add`, `member-remove`,
   `member-role-change`, `collection-create`, `collection-grant`,
   `collection-revoke`, `key-rotate`, `org-init`, `ownership-transfer`,
   `org-delete`.
-- **TODO (pending Dev-B B9–B13):** `item-create`, `item-update`,
-  `item-delete`, `item-restore`, `item-purge` — the emitter code lands with
-  the item-CRUD command stream.
+- **Item CRUD:** `item-create`, `item-update`, `item-delete` (soft-delete /
+  trash), `item-restore`, `item-purge` — emitted by the `org add` / `edit` /
+  `rm` / `restore` / `purge` commands.
 
 ### Honest limitations