test: upgrade.test.ts still expects casting_policy_version 1.1, template bumped to 1.2 in #1643 #1661

Summary

`test/cli/upgrade.test.ts` > `ensureCastingDefaults scaffolds registry.json, policy.json, history.json` hardcodes `casting_policy_version: '1.1'`. #1643 bumped every `casting-policy.json` template mirror to `1.2` (custom universes / descriptive default naming) but didn't touch this assertion. Fails deterministically on `dev` right now, not flaky — hit it on CI for #1660, confirmed identical failure with that PR's diff fully stashed.

Repro

```
npx vitest run test/cli/upgrade.test.ts -t "ensureCastingDefaults scaffolds registry"
```

```
FAIL test/cli/upgrade.test.ts > CLI: upgrade command > ensureCastingDefaults scaffolds registry.json, policy.json, history.json
AssertionError: expected { casting_policy_version: '1.2', …(4) } to have property "casting_policy_version" with value '1.1'
❯ test/cli/upgrade.test.ts:542:20
540| expect(registry).toHaveProperty('agents');
541| const policy = JSON.parse(readFileSync(join(dir, '.squad', 'castin…
542| expect(policy).toHaveProperty('casting_policy_version', '1.1');
```

Fix

One-line: `test/cli/upgrade.test.ts:542`, `'1.1'` → `'1.2'`.