[refactor] Clean up API changelog implementation

- Remove demo-snapshots folder
- Merge workflow documentation into main workflows README
- Convert scripts to TypeScript (.js → .ts)
- Revert eslint.config.ts changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/compare-api-snapshots.ts

@@ -441,4 +441,5 @@ function formatChange(change) {
 const changes = compareApis(previousApi, currentApi)
 const changelog = formatChangelog(changes, previousVersion, currentVersion)
 
+// eslint-disable-next-line no-console
 console.log(changelog)

scripts/snapshot-api.ts

@@ -310,4 +310,5 @@ const sourceFile = ts.createSourceFile(
 const apiSurface = extractApiSurface(sourceFile)
 
 // Output as JSON
+// eslint-disable-next-line no-console
 console.log(JSON.stringify(apiSurface, null, 2))