[CuWilliams]

A new blog post for review and editing before it goes live. Merging this PR publishes it.

Title: Headed for the Store · Date: 2026-10-31 · id: 2026-10-31-headed-for-the-store

What it covers

• Builds 9 to 11 since the last post ("Build 8 is on its way"): quantity per product pair, receipt totals that now prefill, iOS 18 support, the rename to size-adjusted differential, CSV unit prices per 100 g, and the new icon.
• The behind-the-scenes work in plain terms: every calculation now lives in one place and is checked against worked examples, so a second app can be held to the same answers.
• The announcement: the App Store first, after a few weeks of everyday testing, then Google Play. It calls back to the 2026-01-04 "Full Disclosure" post, which said Android users were out of luck.

Checks

• Content conventions: no CRA or tax-compliance claims and no promised deduction, and it uses the shared vocabulary ("product pair", "size-adjusted differential"). The old name "unit price differential" appears only where the post explains why it was retired.
• Every feature claim was checked against docs/RELEASE_NOTES_BUILD_9.md to _11.md in the app repo.
• node scripts/validate-data.js passes, and the post renders at the top of blog.html in a local headless Chrome.

For the author to decide

• Google Play timing. No Android app exists yet; the shared core is the only groundwork. The post says "Google Play after that", with no date.
• App Store timing is "a few weeks", which follows from the device testing that #64 in the app repo still needs.

🤖 Generated with Claude Code