feat: law-source-eurlex 0.1.0 (source.eu-recht)

Fetch one EU legal act from EUR-Lex by CELEX number and return its
FORMEX-4 XML content-addressed (SHA-256), so a flow's audit trail
pins the exact Gesetzesstand it processed.

- CELLAR content negotiation (application/xml;type=fmx4) on
  publications.europa.eu; 303 multiple-choice item selection
- host-pinned redirect handling (max 3 hops), 64 MB body cap
- consolidated CELEX (0...-YYYYMMDD) yields consolidation_date
- net permission pinned to publications.europa.eu; no auth
- 10 unit tests (no network), wasm32-wasip2 build green

Signed-off-by: flemming-it <sf@flemming.it>

assets/icon.svg

@@ -0,0 +1,18 @@
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+  <rect width="64" height="64" rx="12" fill="#08090A"/>
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+    <circle cx="18.5" cy="32" r="2"/>
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+    <circle cx="25.25" cy="20.3" r="2"/>
+  </g>
+</svg>