## Summary
`agnes self-upgrade` without `--force` previously short-circuited on the local 24h `update_check.json` cache. After a server-side version bump within that window, the explicit command exited silently as a no-op — empirically observed today when prod 0.47.1 → 0.47.2 didn't propagate.
Fix: always invalidate the cache in `_resolve_info`. The cache still gates the implicit warning loop in the root callback (correctly — that runs on every `agnes <anything>` and can't hammer `/cli/latest`).
## Test plan
- [x] New `test_self_upgrade_bypasses_24h_cache_without_force` — stale cache claims current; mocked server reports newer; assert UpdateInfo carries the newer version, not the cached one.
- [x] Existing self-upgrade tests pass (including `--force` semantics — force is now downstream-only, behavior preserved).
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