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/_default/single.html

@@ -0,0 +1,36 @@
+{{ define "main" }}
+<article>
+  <header>
+    <h1>{{ .Title }}</h1>
+
+    {{- if not .Date.IsZero }}
+    <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "January 2, 2006" }}</time>
+    {{- end }}
+
+    {{- with .Description }}
+    <p>{{ . }}</p>
+    {{- end }}
+
+    {{- with .GetTerms "tags" }}
+    <nav data-role="tag-cloud" aria-label="Tags">
+      {{- range . }}
+      <a href="{{ .Permalink }}" data-tag="{{ .Name }}">{{ .Name }}</a>
+      {{- end }}
+    </nav>
+    {{- end }}
+  </header>
+
+  {{ .Content }}
+
+  {{- if .PrevInSection }}
+  <footer>
+    {{- with .PrevInSection }}
+    <a href="{{ .RelPermalink }}" rel="prev" data-wikilink>← {{ .Title }}</a>
+    {{- end }}
+    {{- with .NextInSection }}
+    <a href="{{ .RelPermalink }}" rel="next" data-wikilink>{{ .Title }} →</a>
+    {{- end }}
+  </footer>
+  {{- end }}
+</article>
+{{ end }}