Fetch Public Page Stats

Workflow

Supplement CSV with public-page data:
- [ ] Step 1: WebFetch https://thethinkersnotebook.substack.com/ → extract subscriber count
- [ ] Step 2: Compare to csv.subscribers_end; if delta > 5% OR CSV export >24h old, flag as `public > csv`
- [ ] Step 3: For each post with |z| ≥ 1.0 (outliers), WebFetch the post URL
- [ ] Step 4: Extract public "N views" counter; compare to CSV views
- [ ] Step 5: Return {subscribers_public, post_deltas: [...]}
- [ ] Step 6: Cap: ≤10 WebFetch calls per invocation

Use cases

• CSV export was Monday morning; a post went viral Monday afternoon. Public page shows 1380 views; CSV shows 1240. Delta +140 in 6 hours supports external-share attribution.
• Writer forgot to export but wants an unofficial check. Public subscriber count is the best available signal.
• Attribute-performance wants a verification signal for external-share hypothesis.