mosaic coord: board subcommand + roll alias (P3 gap closure) (#1470)

Co-authored-by: marcie <[email protected]>

packages/mosaic/src/commands/launch.ts

@@ -1162,6 +1162,8 @@ const COORD_SUBCMDS: Record<string, string> = {
   test: 'smoke-test.sh',
   resume: 'session-resume.sh',
   recover: 'session-resume.sh',
+  board: 'board-roll.sh',
+  roll: 'board-roll.sh',
 };
 
 function runCoord(args: string[]): never {
@@ -1195,6 +1197,7 @@ Commands:
   run [--project <path>]      Launch runtime with mission context
   smoke                       Run orchestration smoke checks
   resume [--project <path>]   Crash recovery
+  board                      Roll the orchestration board (board-roll.sh)
 
 Runtime: --claude (default) | --codex | --pi | --yolo`);
     process.exit(subcmd === 'help' ? 0 : 1);