test: add missing coverage tests (post-#391 — hooks, full param matrix, config models) (#392)

* test: add missing coverage tests (post-#391 follow-up)

Files that missed the #391 squash merge:
- BootstrapFullParameterMatrixTests: ALL 42 UpdateOptions, 6 chains
  including Client+Upgrade dual full-configuration
- BootstrapHooksAndExtensionsTests: IUpdateHooks lifecycle (5 methods),
  IUpdateReporter, IUpdateEventListener (8 events), security schemes
- ConfigurationModelsTests: BlackListConfig, HubConfig, DownloadAsset/Plan/
  Progress/Result, 9 enums, UpdateOption<T> semantics

Closes #390 (follow-up)

* fix: copilot suggestions - remove OnCustomEvent, fix option counts, drop region counts

- Remove OnCustomEvent from TestEventListener (only 7 IUpdateEventListener methods exist)
- Fix file header: 42 options -> 37 options (matches actual UpdateOptions surface)
- Remove hard-coded test counts from #region headers to prevent drift
- Fix garbled characters in comments

Author: JusterZhu