M10: store assets - Plain Files naming, generated icon/feature graphic, listing copy

CHANGELOG.md

@@ -31,6 +31,21 @@ upload needs a **higher `versionCode`** than every previous upload.
 
 ### Added
 
+- **M10 — store assets.** The app is named **Plain Files** (one string; the `applicationId`
+  was already locked in M0). `tools/make-store-assets.sh` renders the 512×512 RGBA icon and
+  the 1024×500 RGB feature graphic from the app's own icon vectors, so the store icon *is*
+  the launcher icon rather than a lookalike that drifts after the next rebrand.
+  `tools/make-store-screenshots.sh` normalises `adb` captures to Play's 2:1 limit per form
+  factor — a phone at its native 1080×2400 is 2.22:1 and would be rejected outright.
+  [docs/STORE_LISTING.md](docs/STORE_LISTING.md) has the ready-to-paste copy, length-checked
+  against Play's limits, plus the permissions paragraph that the `MANAGE_EXTERNAL_STORAGE`
+  declaration requires. The feature graphic's copy was verified to survive Play's
+  centre-square crop by cropping the rendered PNG, not by trusting the arithmetic.
+
+  **Not finished:** the screenshots themselves. The generator and the raw-capture
+  directories are in place, but no captures have been taken, so `store-assets/screenshots/`
+  is still empty. The listing is publishable except for that.
+
 - **M9 — monetisation.** Decided: a **one-time paid app at €4.49, with a 14-day launch price
   of €2.29**, both set in the Play Console. No ads, no subscription and no in-app purchases —
   which means no Billing client, no `com.android.vending.BILLING` permission and no purchase