chore: bring the token-list enrichment tooling into script/lib (closes #495)

The two node programs and the data file from f7a2437 regenerate the name and
url of each token in src/shared/tokenList.js. They are now CommonJS under
script/lib/, find their files from their own location, and read
ethereum-lists at a pinned commit. The apply step also rewrites an entry that
already has a name and url, so it runs on the current list; on the committed
data it leaves the list unchanged. make enrich-tokens and make
apply-enrichment run them, and README.md names both targets. The data file
carries the MUSD token's on-chain name, so script/check-censored allows that
one literal there too.

Model: opus-5-5

Makefile

@@ -1,4 +1,4 @@
-.PHONY: bootstrap setup install test test-e2e test-e2e-firefox lint fmt fmt-check check check-censored docker hooks build build-debug package vendor-blocklist icons clean dev
+.PHONY: bootstrap setup install test test-e2e test-e2e-firefox lint fmt fmt-check check check-censored docker hooks build build-debug package vendor-blocklist icons enrich-tokens apply-enrichment clean dev
 
 # Standard targets are thin shims; the implementations live in script/
 # per the scripts-to-rule-them-all pattern (see the Entrypoints section
@@ -111,6 +111,17 @@ vendor-blocklist:
 icons:
 	@node script/lib/icons.js
 
+# Fetch a name and a website for every token in src/shared/tokenList.js into
+# script/lib/token-enrichment.json. Run deliberately, land the diff: the names
+# come from live data, so a later run can return different ones.
+enrich-tokens:
+	@node script/lib/enrich-tokens.js
+
+# Write the names and websites in script/lib/token-enrichment.json into
+# src/shared/tokenList.js. Commit the result with the data file.
+apply-enrichment:
+	@node script/lib/apply-enrichment.js
+
 clean:
 	@rm -rf dist/ release/