archive: remove entire archive/ directory and all references

archive/ contained the old narrative wiki (superseded by DB as source
of truth), hermes-plans, oikos-cards, ledger, secrets-issuance, and
SOPS backups — all Python-era artifacts with no ongoing value.

Updated all cross-references in:
- AGENTS.md, README.md
- .agents/operations/commands.md (point to docs/infrastructure/)
- .agents/shared/llm-wiki.md, page-templates.md
- .agents/domains/knowledge/schema.md, operations/schema.md
- .agents/skills/*/SKILL.md
- docs/infrastructure/*.md (removed archive link targets)
- docs-lint/SKILL.md known-baseline note

.agents/skills/lifecycle-migrate-node/SKILL.md

@@ -10,7 +10,7 @@ transition: "active -> migrating -> active"
 # Lifecycle: migrate a node
 
 Modeled on the strong Phase 1+2 migration
-([archive/hermes-plans/2026-06-03_110000-library-ssd-migration-to-ludo-mini.md](../../../archive/hermes-plans/2026-06-03_110000-library-ssd-migration-to-ludo-mini.md)).
+(the strong Phase 1+2 migration).
 Requires (ontology): preflight + backup-verified before migrating;
 post-verify + Caddy backends checked + mounts checked + docs updated
 before returning to `active`.
@@ -32,7 +32,7 @@ before returning to `active`.
 7. MCP `get_service_status` for every service the node hosts.
 8. Set `state: active`. Add a migration note to the node's doc page
    (old host/IP → new, date, phase reference) — this repo's convention
-   for every past migration (see `archive/knowledge/containers/101-jellyfin.md`,
+   for every past migration (see archived container docs,
    `containers/129-house.md`).
 
 Regenerate: `oikos seed` (re-ingests `seeds/inventory.yaml` into the DB —