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tiennm99
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Translates the seven-subcommand engine to Node ESM, one module per former Go file, invoked as `node scripts/newsletter <command>` from the repo root. The Go implementation stays in place for now so parity can be measured against it. Hand-rolled HTML and XML regexes give way to cheerio, which removes the manual string surgery in caption extraction and covers RSS and sitemap XML through xmlMode without a second parser. fetch-via-defuddle gains a local extraction stage ahead of the defuddle.md proxy; the proxy stays, because fetching from a third IP is the whole point when this machine's IP is the blocked one. Both stages now emit the same YAML frontmatter plus body, and an extraction that looks like a bot challenge counts as a local failure so the proxy still runs. Behaviour is preserved where it is load-bearing rather than where it is merely idiomatic: query strings are rebuilt by string surgery so surviving parameters keep their original order and encoding, duplicate detection stays an index loop with byte-offset boundary checks so a prefix of a stored URL is not a false match, empty optional fields are omitted rather than emitted as "", a deep-crawl miss reports cutoff as null rather than dropping the key, bullet filtering counts code points, tag counts keep their six-column alignment, and a malformed percent sequence falls back to the raw substring. The printer lives in its own module so a command module never imports the dispatcher: index.js runs main() at module scope, so that cycle would execute the CLI as a side effect of any import. Missing dependencies report one actionable line instead of a module-resolution stack trace, and a reader that closes early exits quietly instead of raising EPIPE.