Bootstrap Pilgrims of Katan: rebrand, Gitea CI and OTA

Import of ProLibertateGames (upstream main, GPL-3.0) rebranded for
Wallacenet and repointed at git.wallacenet.ca.

- Identity: applicationId ca.wallacenet.pilgrimsofkatan (+ .dev for the dev
  channel), launcher names "Pilgrims of Katan" / "Pilgrims of Katan DEV",
  neutral hexagon branding replacing the Wallace tartan. Uncial Antiqua keeps
  its OFL licence, and the GPL-3.0 LICENSE plus upstream attribution stay.
- OTA: Updater.kt now reads this repo's own Gitea releases
  (/api/v1/repos/devadmin/PilgrimsOfKatan/releases...) and BuildConfig.
  OTA_ENABLED is on; Gitea answers the same JSON shape the code already parsed.
- Build numbers: versionCode = CI run number + plgVersionRunOffset (1000),
  with the tag and versionName derived from the same figure. The offset is
  permanent, because Gitea Actions restarts run numbers at 1 and a reset would
  otherwise make Android reject the next build as a downgrade.
- CI: ci.yml publishes a dev prerelease from dev, release.yml a production
  release from main, both through scripts/publish-release.sh (Gitea REST API,
  runnable by hand until an Actions runner is registered).
- Docs: docs/CI.md records the channel, numbering and runner decisions;
  docs/README.md seeds the per-game RULES-* conventions; CLAUDE.md carries the
  agent ground rules.

Verified: ./gradlew assembleDebug and testDebugUnitTest green on JDK 17 /
compileSdk 34, both variants stamped, installing side by side under the new
identity.

Co-Authored-By: Paperclip <[email protected]>

gradle.properties

@@ -23,3 +23,11 @@ android.nonTransitiveRClass=true
 # it keeps climbing on its own and an APK's versionCode never goes backwards
 # when this changes.
 plgVersionSeries=1.4
+
+# The permanent floor under every stamped build number: versionCode (and the
+# release tag, and versionName) are `run number + this`. Gitea Actions starts
+# run numbers at 1 for each workflow, so without it the first Gitea-era release
+# would be build 1 — the same number an unstamped local build already carries —
+# and any later reset would make Android reject the next build as a downgrade.
+# Set once, at bootstrap, and never changed again: see docs/CI.md.
+plgVersionRunOffset=1000