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archive/ contained the old narrative wiki (superseded by DB as source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/runbook-dpkg-interrupted/SKILL.md

@@ -106,8 +106,8 @@ Then `systemctl status apt-recovery` from a fresh ssh to check progress.
 ## Related
 
 - [Operations cheatsheet](../../operations/commands.md)
-- [Auto-deploy pipelines](../../../archive/knowledge/infrastructure/auto-deploy.md)
-- [Hubris host page](../../../archive/knowledge/hosts/hubris.md)
+- [Auto-deploy pipelines](../../../docs/infrastructure/auto-deploy.md)
+- Hubris host page
 
 ## Changelog