shared: opt-in CIP-33 reference-scripts for script-spending txs

When ESCROW_REF_UTXO / ADVERT_REF_UTXO env vars are set (format
<txhash>#<idx>), Claim/Submit/Accept/Reclaim/RetireAdvert call
.readFrom([refUtxo]) instead of inlining the validator CBOR via
.attach.SpendingValidator(). Lucid-evolution 0.4.30 auto-extracts
utxo.scriptRef into the script-witness map (dist/index.js:1903–1913),
so no separate attach call is needed. Default (env unset) is unchanged.

Adds buildLiveTxForPublishReferenceScripts (a one-shot tx that
publishes both validators as scriptRef-bearing UTxOs at a caller-
supplied address — typically the all-zero-pkh enterprise burn address)
and the supplier tx:publish-reference-scripts CLI that wraps it.

Targeted at testnet trial; mainnet rollout is a separate flip after
verification.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

supplier/package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "typecheck": "tsc --noEmit",
     "tx:post-advert": "tsx src/cli/post-advert.ts",
-    "tx:retire-advert": "tsx src/cli/retire-advert.ts"
+    "tx:retire-advert": "tsx src/cli/retire-advert.ts",
+    "tx:publish-reference-scripts": "tsx src/cli/publish-reference-scripts.ts"
   },
   "dependencies": {
     "@marketplace/shared": "workspace:*",