Fix widget App Intents packaging

[ngutman]

Summary

• generate and bundle Metadata.appintents for CodexBarWidget during packaging so the widget extension ships the App Intents metadata WidgetKit expects
• keep widget configuration intent parameters non-optional and use @Parameter(default:) for Codex / Credits defaults instead of optional fallback helpers
• update focused widget tests to assert the configuration intent defaults directly

Why

This supersedes #782 while preserving the original fix from @vincentyangch.

The packaging issue is real: the packaged widget extension was shipping without Resources/Metadata.appintents, and this branch keeps that fix. The follow-up cleanup keeps the App Intent model aligned with Apple's documented widget configuration style by using non-optional parameters with defaults rather than optional parameters plus runtime fallback helpers.

Details

• retains commit ab904049 from @vincentyangch for widget metadata generation and packaging
• adds follow-up commit 7d9d440b to replace optional widget configuration parameters with @Parameter(default:)
• removes now-unnecessary resolvedWidgetProvider / resolvedCompactMetric helpers
• updates tests to cover default intent construction

Validation

• swift test -q --filter CodexBarWidgetProviderTests
• pnpm check
• ./Scripts/compile_and_run.sh
• verified packaged widget bundle contains:
  • Metadata.appintents/version.json
  • Metadata.appintents/extract.actionsdata

Credit

Original packaging fix by @vincentyangch in #782; this PR carries that change forward with a small follow-up cleanup.