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archive/ contained the old narrative wiki (superseded by DB as source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

README.md

@@ -135,18 +135,20 @@ ssh/                Deploy keys + authorized_keys management
 vps/                Caddy/TURN config templates for the netbird VPS
 nomos/              Nomos config, persona, skills
 .agents/            Agent instruction files, shared conventions, skills
-archive/            Historical reference (legacy wiki, plans, SOPS backups)
 plans/              Design documents (active + done)
 docs/adr/           Architecture decision records
 docs/operations/    Runbooks (rollback, etc.)
+docs/infrastructure/ Homelab infrastructure architecture
+docs/secrets/       Secret management procedures
+docs/GLOSSARY.md    Term definitions
 ```
 
 ## For agents
 
 See [AGENTS.md](AGENTS.md) for the full orientation. Quick reference:
 
-- **Source of truth:** DB (runtime) then seeds (bootstrap). Old wiki is
-  archived at `archive/knowledge/` — use MCP `search_knowledge` instead.
+- **Source of truth:** DB (runtime) then seeds (bootstrap). Old wiki was
+  archived at `archive/knowledge/` (since deleted) — use MCP `search_knowledge` instead.
 - **Mutations:** classify against policy, request approval for
   `destructive`/`config_mutation`
 - **Secrets:** Infisical (primary) or SOPS (fallback) — never hardcode