Move to the 1.1 series, from one place rather than three

The series a build is named for was written out three times — in the
build file and in both workflows' tag lines — so bumping it meant
changing all three and a release could be tagged one thing and built as
another. It now lives in gradle.properties as plgVersionSeries, which
the build reads when it stamps the APK and both workflows read when they
name the tag.

Set to 1.1.

versionCode is deliberately left as the CI run number alone, which is
what makes the bump safe: the run number keeps climbing across a change
of series, so 1.1 never looks like a downgrade to Android and an OTA
update is not interrupted. The series is a name for people; the run
number is what the machines compare. The updater already read only the
trailing number, and its comments now say so rather than naming 1.0.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_019Pr6B8xDDtJJcb6WJMw7Ud

app/src/main/java/org/prolibertate/games/update/Updater.kt

@@ -38,7 +38,7 @@ private const val DEV_SUFFIX = "-dev"
 /**
  * Over-the-air updates from the repository's GitHub Releases.
  *
- * Release tags are v1.0.<run-number> and the APK's versionCode is that same run
+ * Release tags are v<series>.<run-number> and the APK's versionCode is that same run
  * number, so comparing the two is enough to tell whether a newer build exists.
  * The repository's releases must be publicly downloadable — no token is
  * embedded in the app, and GitHub blocks anonymous access to private assets.
@@ -112,7 +112,9 @@ class Updater(private val activity: Activity) {
 
     private fun toRelease(json: JSONObject): Release? {
         val tag = json.optString("tag_name").ifBlank { return null }
-        // Tags are v1.0.<n> or v1.0.<n>-dev; the run number is the trailing part.
+        // Tags are v<series>.<n>, with -dev on a prerelease. Only the trailing
+        // run number is read: the series is a name for people and changing it
+        // must not make an older build look newer.
         val versionCode = tag.substringAfterLast('.')
             .removeSuffix(DEV_SUFFIX)
             .toIntOrNull()