docs: drop dated self-corrections

Remove dates and "this used to say X" framing from prose and comments.
What the tree does now is the only thing that matters; the history is in
git.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/build.gradle.kts

@@ -34,7 +34,7 @@ android {
         // lower than the installed one, so a code that goes backwards makes a
         // release uninstallable for everybody already on the higher number.
         // The code is one ahead of the name, deliberately. 0.11 was built
-        // on 2026-09-07 and never published; the build that followed it went out
+        // and never published; the build that followed it went out
         // as versionCode 12 before the name was settled on. Going back to code
         // 11 would make the release uninstallable for anyone already on 12, see
         // the paragraph above, so the code keeps climbing and the NAME is what
@@ -64,7 +64,7 @@ android {
     // This app's OWN key, not the one every Flamenet Android app shares.
     // `.flamenet-android-signing.properties` was made for Flamenet Files, and
     // because the path is app-agnostic this app silently inherited it, every
-    // release before 2026-08-25 went out as `CN=Flamenet Files`. Nobody chose
+    // release before that went out as `CN=Flamenet Files`. Nobody chose
     // that for a messenger; it fell out of the layout.
     //
     // It matters because an Android signing key is permanent: once a device