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

DESIGN.md

@@ -164,7 +164,7 @@ The enterprise org vault is a **second git repository** alongside each member's
 - **relicario-server** gains an **org mode**: a new `[lib]` target (`classify_path`, `extract_schema_version`) plus the `verify-org-commit` and `generate-org-hook` subcommands — a signature-verifying, path-scoped pre-receive hook (see `docs/SECURITY.md`).
 - **extension** org switch + read parity is a tracked follow-up (Dev-D) — `TODO (extension follow-up)`.
 
-Status: core (A) + server hook (C) merged; CLI admin/rotate/status-audit merged; CLI item-CRUD + the final command wiring are `TODO (pending Dev-B B9–B14)`.
+Status: the backend is complete on `main` — core (A) org module, server hook (C), and the full CLI (all 19 `org` subcommands incl. item CRUD) are merged. Deferred: `org add`/`edit` parity for Card/Key/Document/Totp (Login/SecureNote/Identity ship today), and the extension org switch + read parity (`TODO (extension follow-up)`, Dev-D).
 
 ## Build matrix