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>

docs/diagrams/builtin-commands-diagram.puml

@@ -0,0 +1,76 @@
+@startuml builtin-commands-diagram
+title CR-Core — Default /core team commands
+
+skinparam classAttributeIconSize 0
+hide empty members
+
+package "fr.luc.crcore.command" {
+  abstract class BaseCommand
+  abstract class SubCommand
+}
+
+package "fr.luc.crcore.command.builtin" {
+
+  class CoreCommand {
+    + CoreCommand(teamSvc, playerSvc)
+    # registerDefaults(): void
+  }
+  CoreCommand --|> BaseCommand
+
+  package "fr.luc.crcore.command.builtin.team" {
+
+    class TeamGroupSubCommand {
+      + TeamGroupSubCommand(service)
+      # registerDefaults(): void
+    }
+    TeamGroupSubCommand --|> SubCommand
+
+    class TeamArgumentTypes <<utility>> {
+      + {static} teamByName(service): ArgumentType<Team>
+    }
+
+    class TeamCreateSubCommand {
+      + execute(ctx): CommandResult
+    }
+    class TeamDeleteSubCommand
+    class TeamAddSubCommand
+    class TeamRemoveSubCommand
+    class TeamJoinSubCommand
+    class TeamLeaveSubCommand
+    class TeamInfoSubCommand
+    class TeamListSubCommand
+    class TeamTransferSubCommand
+    class TeamVisibilitySubCommand
+    class TeamScoreSubCommand
+    class TeamTopSubCommand
+    class TeamSetSpawnSubCommand
+
+    TeamCreateSubCommand --|> SubCommand
+    TeamDeleteSubCommand --|> SubCommand
+    TeamAddSubCommand --|> SubCommand
+    TeamRemoveSubCommand --|> SubCommand
+    TeamJoinSubCommand --|> SubCommand
+    TeamLeaveSubCommand --|> SubCommand
+    TeamInfoSubCommand --|> SubCommand
+    TeamListSubCommand --|> SubCommand
+    TeamTransferSubCommand --|> SubCommand
+    TeamVisibilitySubCommand --|> SubCommand
+    TeamScoreSubCommand --|> SubCommand
+    TeamTopSubCommand --|> SubCommand
+    TeamSetSpawnSubCommand --|> SubCommand
+
+    CoreCommand "1" *-- "1" TeamGroupSubCommand : contains
+    TeamGroupSubCommand "1" *-- "13" SubCommand : contains
+  }
+}
+
+note right of CoreCommand
+  Le plugin de jeu downstream
+  remplace une feuille avec :
+  core.getCoreCommand()
+      .findSubCommand("team")
+      .replaceSubCommand("create",
+          new MyCreate(svc));
+end note
+
+@enduml