feat: host bundled reference-module .chain bundles

Content-addressed .chain bundles for the Ch∆In bundled store. The
platform seed (crates/chain_hub/store-index/seed.yaml) points its
wasm_urls at this repo's Forgejo-raw paths; each entry's sha256 in the
seed pins the bundle, so trust does not depend on the host.

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

SHA256.txt

@@ -0,0 +1,9 @@
+e068f0045737b35d43c4be3efc663702844d69501c6acc80d3e9664bff3c169c  echo-0.1.0.chain
+a94d761c9b4a418876177e3ec582f9197ee3b8f5197fdb5deba74a37dfe9124d  http-request-0.1.0.chain
+95cc879b6a87e412b95e02ddf5870a382162e3615a90d681d2cc01245648fe04  llm-chat-0.1.0.chain
+e25e95355f47e8771277f8b47aa2aeb191107be36474a59b0f4c9eb3b1d23fc6  studio-theme-solarized-0.1.0.chain
+ceb6bc1e05b278bd757f8bc9c2cf6e6320d3f5fcfd9493668d16cf5161631a4e  studio-translate-ollama-0.1.0.chain
+0821fe01fac672e924dc7a710a7de53587949d6348a3b9d4f65958b0f53bb68a  text-anonymize-0.1.0.chain
+1d6c66f255e1a7ce41b6a470212c1473a15e33785585436051fb8bcc3fcc2835  text-extract-0.1.0.chain
+b4ff0e7daee9f9d72f46ad2fa227568320cccaf70a6a946cb7f76f58eba6bcef  text-summarize-0.1.0.chain
+4f14dd997fe28005c41ff1d485aab1c2fbf30540a7d931f7140ceeaa2890ddb2  text-translate-0.1.0.chain