Shell: trailing comments after semicolon never submit

Symptom

In the browser shell, a statement that ends with ; followed by a -- or /* */ comment stays on the continuation prompt (learn->) instead of running.

Examples that fail to submit:

• SELECT 1; -- done
• SELECT 1;/* done */
• SELECT 1;\n-- done

Expected

isStatementComplete (and the shell docstring) treat the last non-comment, non-whitespace character as decisive — so these should submit like psql.

Red loop (already run)

import { isStatementComplete } from './components/shell/sql-complete.ts';
isStatementComplete('SELECT 1; -- x'); // got false, expect true

Where

• components/shell/sql-complete.ts — final check is /;\s*$/, which does not skip trailing comments
• Called from components/shell/readline.ts on Enter

Notes

Diagnosed with /diagnosing-bugs. Minimized repro is the three inputs above; plain SELECT 1; still works.