feat(fleet): brain-home split — fleet state under ~/.mosaic, templates stay config-home (#1298)

Co-authored-by: Jason Woltje <[email protected]>

packages/mosaic/src/commands/fleet-migration-command.ts

@@ -1,5 +1,6 @@
 import { readFile } from 'node:fs/promises';
 import { join } from 'node:path';
+import { fleetAgentEnvDir, fleetRolesLocalDir } from '../fleet/brain-home.js';
 import type { Command } from 'commander';
 import {
   parseV1MigrationObservations,
@@ -120,11 +121,11 @@ export function registerFleetMigrationCommand(
           observations,
           personaDirs: {
             rolesDir: deps.rolesDir ?? join(mosaicHome, 'fleet', 'roles'),
-            overrideDir: deps.overrideDir ?? join(mosaicHome, 'fleet', 'roles.local'),
+            overrideDir: deps.overrideDir ?? fleetRolesLocalDir(mosaicHome),
           },
           environment: {
             mosaicHome,
-            agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
+            agentEnvDir: fleetAgentEnvDir(mosaicHome),
           },
         });
         printJson(preview);