asw-v01: archive deferred content (packs, site, lab, legacy examples)

- 2.1: packs/ -> archive/packs/
- 2.2: site/ -> archive/site/
- 2.3: src/lab/ -> archive/lab/
- 2.4: examples/ -> archive/examples-legacy/ (SSI-based)

archive/site/layouts/partials/meta/ai-disclosure.html

@@ -0,0 +1,25 @@
+{{- /*
+  partials/meta/ai-disclosure.html — AI-generated content disclosure
+
+  Emits the proposed W3C/WHATWG AI content disclosure meta tag and the
+  corresponding HTTP-equiv header that satisfies EU AI Act Article 50
+  obligations for AI-generated/AI-assisted web content.
+
+  The disclosure level is controlled per-page via front matter:
+    ai_content: "generated"   — fully AI-generated content
+    ai_content: "assisted"    — human-written with AI assistance (default)
+    ai_content: "reviewed"    — AI-generated, human-reviewed and edited
+    ai_content: "none"        — no AI involvement (suppresses the tag)
+
+  Site-wide default in hugo.toml:
+    [params]
+      ai_content = "assisted"   # default for all pages
+
+  Reference:
+    https://github.com/nickvdyck/ai-content-disclosure
+    EU AI Act Article 50 (transparency obligations, Chapter IV)
+*/ -}}
+{{- $level := or .Params.ai_content .Site.Params.ai_content "assisted" -}}
+{{- if ne $level "none" -}}
+<meta name="ai-content-disclosure" content="{{ $level }}">
+{{- end }}