feat: complete CLI command parity — add coord, prdy, seq, upgrade

The #351 merge landed before the force-push with full commands.
This adds the missing subcommands:

- mosaic coord {init,status,mission,continue,run,smoke,resume}
  → delegates to tools/orchestrator/*.sh with --claude/--codex/--pi/--yolo
- mosaic prdy {init,update,validate,status}
  → delegates to tools/prdy/*.sh with --claude/--codex/--pi
- mosaic seq {check,fix,start}
  → sequential-thinking MCP management (native TS)
- mosaic upgrade {release,check,project}
  → delegates to tools/_scripts/mosaic-release-upgrade and mosaic-upgrade

Also removes duplicate prdy registration (was in both launch.ts and
the old registerPrdyCommand — now only in launch.ts).

packages/cli/src/cli.ts

@@ -5,7 +5,7 @@ import { Command } from 'commander';
 import { createQualityRailsCli } from '@mosaic/quality-rails';
 import { registerAgentCommand } from './commands/agent.js';
 import { registerMissionCommand } from './commands/mission.js';
-import { registerPrdyCommand } from './commands/prdy.js';
+// prdy is registered via launch.ts
 import { registerLaunchCommands } from './commands/launch.js';
 
 const _require = createRequire(import.meta.url);
@@ -298,10 +298,6 @@ registerAgentCommand(program);
 
 registerMissionCommand(program);
 
-// ─── prdy ──────────────────────────────────────────────────────────────
-
-registerPrdyCommand(program);
-
 // ─── quality-rails ──────────────────────────────────────────────────────
 
 const qrWrapper = createQualityRailsCli();