feat: SQLite persistence, default /core commands, Bukkit events, bootstrap

CRCore bootstrap class: one-line setup for game plugins (new CRCore(this).enable()).
Wires SQLite, services with event firing, and the /core command tree.

SQLite layer (fr.luc.crcore.database): Database wrapper exposing execute/update/
queryOne/query plus a fluent TableBuilder. ColumnType enum, RowMapper interface,
DatabaseException. Game plugins create their own tables in 2 lines via
db.table("foo").ifNotExists().column(...).create().

Repositories: SqliteTeamRepository and SqlitePlayerProfileRepository extend their
InMemory counterparts (write-through cache). 5 internal tables prefixed crcore_.

Command framework refactored for nested sub-commands: subcommand storage moved
from BaseCommand to AbstractCommand, recursive dispatch() and tabComplete(),
replaceSubCommand() for plugin overrides.

Default /core team commands (13 leaf sub-commands): create, delete, add, remove,
join, leave, info, list, transfer, visibility, score, top, setspawn. Each in its
own class under fr.luc.crcore.command.builtin.team, fully substitutable.

Bukkit events: 9 team events (Create/Dissolve/MemberAdd/MemberRemove/PlayerJoin/
LeadershipTransfer/VisibilityChange/ScoreChange/SpawnPointChange) + 3 player
events (ProfileCreate/Delete/ScoreChange). All post-only, non-cancellable.
BukkitEventFiringTeamServiceImpl and BukkitEventFiringPlayerProfileServiceImpl
override the on* hooks to call Bukkit.getPluginManager().callEvent.

JavaDoc on all new public classes and key existing ones. docs/, GEMINI.md and
PUML diagrams synced: new sections (built-in commands, events, database,
bootstrap), 4 new diagrams (builtin-commands, events, database, bootstrap-
sequence), and 7 new architecture decisions logged.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pom.xml

@@ -10,12 +10,13 @@
     <packaging>jar</packaging>
 
     <name>CR-Core</name>
-    <description>Reusable core library for CR Minecraft game plugins (teams, commands, common abstractions).</description>
+    <description>Reusable core library for CR Minecraft game plugins (teams, players, scores, commands, events, SQLite persistence).</description>
 
     <properties>
         <maven.compiler.source>16</maven.compiler.source>
         <maven.compiler.target>16</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <sqlite.version>3.45.3.0</sqlite.version>
     </properties>
 
     <repositories>
@@ -40,6 +41,18 @@
             <version>1.16.5-R0.1-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
+        <!--
+            SQLite JDBC driver. Scope compile so consumer plugins that depend on
+            CR-Core get it transitively. They are expected to shade it into
+            their final jar (or declare the dependency themselves) since Paper
+            does not bundle it.
+        -->
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>${sqlite.version}</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 
     <build>