feat: legacy import — packs, examples, lab, themes, docs, lineage

Import from agentic-semantic-web/ into restructured repo:
- 7 packs (apache, caddy, flask, hugo, nginx, pandoc, python)
- shared error pages (403-503)
- 17 lab experiments (boilerplate, charts, misc)
- 31 example pages (charts, components, content, layout, vault)
- 2 themes (garden, trentuna stub)
- 4 docs (llms.txt, vocabulary, philosophy, agent-directive)
- lineage.md (Pico/Open Props/Charts.css history)
- Hugo mounts for lab/ and examples/

All agentic.css references updated to asw.css.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packs/hugo/layouts/partials/head.html

@@ -0,0 +1,20 @@
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>
+  {{- if .IsHome -}}
+    {{ .Site.Title }}
+  {{- else -}}
+    {{ .Title }} · {{ .Site.Title }}
+  {{- end -}}
+</title>
+{{- with .Description }}<meta name="description" content="{{ . }}">{{- end }}
+{{- if not .Description }}{{- with .Site.Params.description }}<meta name="description" content="{{ . }}">{{- end }}{{- end }}
+
+<!-- ASW framework CSS — absURL ensures correct path when served at a subpath -->
+<link rel="stylesheet" href="{{ "css/asw.css" | absURL }}">
+<!-- Trentuna theme tokens: Inter, JetBrains Mono, dark palette -->
+<link rel="stylesheet" href="{{ "css/theme.css" | absURL }}">
+
+{{- range .AlternativeOutputFormats -}}
+<link rel="{{ .Rel }}" type="{{ .MediaType.Type }}" href="{{ .Permalink | safeURL }}">
+{{- end }}