feat(fleet): harden v1 migration preview

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/mosaic/src/fleet/v1-v2-migration.ts

@@ -1,6 +1,5 @@
 import { createHash } from 'node:crypto';
 import { readFile } from 'node:fs/promises';
-import { homedir } from 'node:os';
 import { join } from 'node:path';
 import YAML from 'yaml';
 import { canonicalizeRoleClass, type PersonaDirs } from '../commands/fleet-personas.js';
@@ -646,11 +645,14 @@ export async function previewV1ToV2Migration(
     }
   }
 
+  const canonicalInventoryOnlyAgents = [...inventoryOnlyAgents].sort((left, right): number =>
+    compareCodePoints(left.name, right.name),
+  );
   const status = blockers.length === 0 ? 'ready' : 'blocked';
   return {
     status,
     inventory,
-    inventoryOnlyAgents,
+    inventoryOnlyAgents: canonicalInventoryOnlyAgents,
     blockers,
     ...(status === 'ready' && canonicalRoster && canonicalYaml
       ? { canonicalRoster, canonicalYaml }
@@ -664,10 +666,12 @@ export async function previewV1ToV2Migration(
       ...(status === 'ready' && canonicalYaml
         ? { candidate: { sha256: sha256(canonicalYaml), generation: decisions.generation } }
         : {}),
-      observations,
+      observations: [...observations].sort((left, right): number =>
+        compareCodePoints(left.agent, right.agent),
+      ),
       excludedInventory: [
         ...(raw.connector === undefined ? [] : ['connector']),
-        ...inventoryOnlyAgents.map(({ name }): string => `agents.${name}`),
+        ...canonicalInventoryOnlyAgents.map(({ name }): string => `agents.${name}`),
       ],
       recovery: {
         executable: false,
@@ -1161,9 +1165,7 @@ function normalizeRuntimes(
     }
     const runtime = record(value);
     const resetCommand =
-      stringValue(runtime.reset_command) ||
-      stringValue(runtime.resetCommand) ||
-      V1_RUNTIME_RESETS[name];
+      stringValue(runtime.reset_command) || stringValue(runtime.resetCommand) || '/clear';
     result[name] = { reset_command: resetCommand };
   }
   return result;
@@ -1294,15 +1296,11 @@ function generatedValues(
     MOSAIC_AGENT_MODEL: agent.model,
     MOSAIC_AGENT_REASONING: agent.reasoning,
     MOSAIC_AGENT_TOOL_POLICY: agent.toolPolicy,
-    MOSAIC_AGENT_WORKDIR: expandHome(agent.workingDirectory),
+    MOSAIC_AGENT_WORKDIR: agent.workingDirectory,
     MOSAIC_TMUX_SOCKET: roster.tmux.socketName,
   };
 }
 
-function expandHome(path: string): string {
-  return path === '~' ? homedir() : path.startsWith('~/') ? join(homedir(), path.slice(2)) : path;
-}
-
 function safeEnvironmentDiagnostic(error: unknown): string {
   if (
     typeof error === 'object' &&