Function httpRepros

scripts/repro-open-issues.ts:177–333

(base: string)

// ─── HTTP repros (optional) ───────────────────────────────────────────

async function httpRepros(base: string): Promise<void> {
  const uid = () => `repro-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;

  // #119 illegal POST content-type
  {
    const room = uid();
    await fetch(`${base}/_/${room}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'text/plain' },
      body: 'cell:A1:t:hello\n',
    });
    await fetch(`${base}/_/${room}`, {
      method: 'POST',
      body: '1,2,3', // missing Content-Type
    });
    const csv = await fetch(`${base}/_/${room}/csv`);
    const html = await fetch(`${base}/_/${room}/html`);
    record(
      119,
      'GET export after bad POST',
      csv.ok && html.ok ? 'fixed' : 'broken',
      `csv=${csv.status}, html=${html.status}`,
    );
  }

  // #385 / recalc via POST
  {
    const room = uid();
    await fetch(`${base}/_/${room}`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ command: ['set A1 value n 1', 'set A2 value n 2', 'set A3 formula SUM(A1:A2)'] }),
    });
    const cells = await fetch(`${base}/_/${room}/cells/A3`);
    const j = (await cells.json()) as { datavalue?: number };
    record(385, 'Recalc after API POST', j.datavalue === 3 ? 'fixed' : 'broken', `A3=${j.datavalue}`);
  }

  // #304 via PUT csv
  {
    const room = uid();
    const csv = '1,=A1*2\n2,=A2*2\n';
    await fetch(`${base}/_/${room}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'text/csv' },
      body: csv,
    });
    const snap = await fetch(`${base}/_/${room}`);
    const body = await snap.text();
    const hasFormula = body.includes('formula');
    record(304, 'PUT csv preserves formulas', hasFormula ? 'fixed' : 'unchanged', hasFormula ? 'snapshot has formula' : 'no formula in snapshot');
  }

  // #442 DELETE + formdata sibling
  {
    const room = uid();
    await fetch(`${base}/_/${room}`, {
      method: 'POST',