Fix gradle aapt2 linking

CLAUDE.md

@@ -20,11 +20,14 @@ This is a lab project (`lab` skill conventions apply) EXCEPT:
 ## NixOS aapt2 workaround
 
 AGP cannot run the Maven-downloaded aapt2 on NixOS (dynamically linked
-generic Linux binary). The nix shellHook rewrites the
-`android.aapt2FromMavenOverride` line in `gradle.properties` to point at
-the SDK's nix-patched aapt2 on every `nix develop`. The sentinel value
-`__NIX_SHELLHOOK_SETS_THIS__` is what's tracked in git; the shellHook
-replaces it before any gradle command runs.
+generic Linux binary). The flake's dev shell ships a wrapped `gradle` that
+always passes `-Dorg.gradle.project.android.aapt2FromMavenOverride=<sdk
+aapt2>` on the command line; Gradle turns `org.gradle.project.*` system
+props into project properties, which is what AGP reads. It must be a CLI
+arg: the nixpkgs-25.11 gradle wrapper ignores `GRADLE_OPTS` (fixed
+post-25.11, nixpkgs PR #449037 — the flake wrapper can be dropped once
+the pin moves past 25.11). No file rewriting; `gradle.properties` stays
+untouched.
 
 ## Commands (user-run, from repo root)