fix: restore real Wellfound apply logic in lib/apply/wellfound.mjs (not a stub)

lib/apply/wellfound.mjs

@@ -1,10 +1,37 @@
 /**
- * wellfound.mjs — Wellfound ATS handler
- * TODO: implement
+ * wellfound.mjs — Wellfound apply handler
  */
-export const SUPPORTED_TYPES = ['wellfound'];
+import {
+  NAVIGATION_TIMEOUT, PAGE_LOAD_WAIT, FORM_FILL_WAIT, SUBMIT_WAIT
+} from '../constants.mjs';
+
+export const SUPPORTED_TYPES = ['wellfound', 'wellfound_apply'];
 
 export async function apply(page, job, formFiller) {
-  return { status: 'skipped_external_unsupported', meta: { title: job.title, company: job.company },
-           externalUrl: job.apply_url, ats_platform: 'wellfound' };
+  await page.goto(job.url, { waitUntil: 'domcontentloaded', timeout: NAVIGATION_TIMEOUT });
+  await page.waitForTimeout(PAGE_LOAD_WAIT);
+
+  const meta = await page.evaluate(() => ({
+    title: document.querySelector('h1')?.textContent?.trim(),
+    company: document.querySelector('[class*="company"] h2, [class*="startup"] h2, h2')?.textContent?.trim(),
+  }));
+
+  const applyBtn = await page.$('a:has-text("Apply"), button:has-text("Apply Now"), a:has-text("Apply Now")');
+  if (!applyBtn) return { status: 'no_button', meta };
+
+  await applyBtn.click();
+  await page.waitForTimeout(FORM_FILL_WAIT);
+
+  const unknowns = await formFiller.fill(page, formFiller.profile.resume_path);
+
+  if (unknowns[0]?.honeypot) return { status: 'skipped_honeypot', meta };
+  if (unknowns.length > 0) return { status: 'needs_answer', pending_question: unknowns[0], meta };
+
+  const submitBtn = await page.$('button[type="submit"]:not([disabled]), input[type="submit"]');
+  if (!submitBtn) return { status: 'no_submit', meta };
+
+  await submitBtn.click();
+  await page.waitForTimeout(SUBMIT_WAIT);
+
+  return { status: 'submitted', meta };
 }