feat(fleet): add reviewed v1-to-v2 migration preview (#788)

packages/mosaic/src/commands/fleet.ts

@@ -35,6 +35,10 @@ import {
   registerFleetAgentCrudCommands,
   type FleetAgentCrudCommandDeps,
 } from './fleet-agent-crud-command.js';
+import {
+  registerFleetMigrationCommand,
+  type FleetMigrationCommandDeps,
+} from './fleet-migration-command.js';
 import {
   executeReconcilerCommandJson,
   registerFleetReconcilerCommands,
@@ -97,6 +101,7 @@ export interface FleetCommandDeps {
   isStdinTTY?: boolean;
   projectionApplier?: FleetAgentCrudCommandDeps['projectionApplier'];
   reconcileDeps?: FleetReconcilerCommandDeps['reconcileDeps'];
+  migrationDeps?: Omit<FleetMigrationCommandDeps, 'mosaicHome'>;
 }
 
 export interface FleetPaths {
@@ -480,7 +485,7 @@ function generateAgentEnvValues(
     MOSAIC_AGENT_MODEL: agent.modelHint ?? '',
     MOSAIC_AGENT_REASONING: agent.reasoningLevel ?? '',
     MOSAIC_AGENT_TOOL_POLICY: agent.toolPolicy ?? '',
-    MOSAIC_AGENT_WORKDIR: expandHome(workingDirectory),
+    MOSAIC_AGENT_WORKDIR: workingDirectory,
     MOSAIC_TMUX_SOCKET: agent.socket ?? roster.tmux.socketName,
   };
 }
@@ -2048,6 +2053,10 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
   // Roster-v2 desired-state mutations belong directly to the fleet control
   // plane; they do not share the root `mosaic agent` gateway-backed surface.
   registerFleetAgentCrudCommands(cmd, deps);
+  registerFleetMigrationCommand(cmd, {
+    ...deps.migrationDeps,
+    mosaicHome: deps.mosaicHome,
+  });
   registerFleetReconcilerCommands(cmd, {
     runner,
     mosaicHome: deps.mosaicHome,
@@ -2411,10 +2420,6 @@ function resolveMosaicHomeFromCommand(command: Command, override?: string): stri
   return opts.mosaicHome ?? override ?? defaultMosaicHome();
 }
 
-function expandHome(path: string): string {
-  return path === '~' || path.startsWith('~/') ? join(homedir(), path.slice(2)) : path;
-}
-
 async function stopFleetBestEffort(runner: CommandRunner, agentNames: string[]): Promise<void> {
   const failures: string[] = [];
   for (const agentName of agentNames) {