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/nginx/nginx-errors.conf

@@ -0,0 +1,25 @@
+# ASW Nginx Error Pages — config snippet
+#
+# Paste this into your nginx server block.
+# Adjust the alias path to where your agentic-semantic-web repo lives.
+#
+# Assumes asw.css is served at /asw/asw.css
+# (see nginx-asw-css.conf for the CSS serving block)
+
+# ── Error pages ──────────────────────────────────────────────────────────────
+
+error_page 400 /errors/400.html;
+error_page 401 /errors/401.html;
+error_page 403 /errors/403.html;
+error_page 404 /errors/404.html;
+error_page 500 /errors/500.html;
+error_page 502 /errors/502.html;
+error_page 503 /errors/503.html;
+
+# Serve error pages from the ASW repo.
+# `internal` means these URLs are only accessible via internal redirects (error_page),
+# not directly from the browser — prevents users from 200ing your error pages.
+location /errors/ {
+    alias /home/exedev/projects/agentic-semantic-web/errors/;
+    internal;
+}