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archive/ contained the old narrative wiki (superseded by DB as source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/docs-lint/SKILL.md

@@ -14,12 +14,11 @@ links. Prose-voice rules are not machine-checkable — those stay a review respo
 
 Run from the repo root:
 
-    python3 .agents/skills/docs-lint/lint.py            # default: knowledge/ .agents/ operations/ investigations/ plans/
-    python3 .agents/skills/docs-lint/lint.py archive/knowledge/containers/104-gitea.md
+    python3 .agents/skills/docs-lint/lint.py            # default: .agents/ operations/ plans/
 
 Exit code is non-zero when any violation is found, so it can gate a commit. The banned-vocabulary
 list mirrors `writing-style.md`; update both together if the standard changes.
 
-> **Known baseline.** `archive/knowledge/containers/101-jellyfin.md` links into a sibling repo
-> (`devops/homelab-authentik-admin`) that this checkout does not contain — expected, not a bug.
+> **Known baseline.** The sibling repo `dtoro/caddy-conf` is not part of this checkout,
+> so links into it produce false positives — expected, not a bug.
 > Any other broken link is a real regression; investigate before dismissing it as baseline noise.