Add preview capture filtering controls

[static-var]

Summary

• add maxPreviewParameterValues configuration with CLI override
• add CLI previewNameFilter support for comma-separated filters
• add capture-only viewportFilter support
• prefilter previews before PreviewParameter expansion so unrelated providers are not resolved
• support base parameterized IDs, expanded IDs, shorthand previewParam-N, names, and function fragments
• add concise capture summary counts

CLI examples

-PagentPreview.previewNameFilter=PrismButtonPreview
-PagentPreview.maxPreviewParameterValues=1
-PagentPreview.viewportFilter=phone

Verification

• build-brief ./gradlew spotlessCheck detekt :plugin:test :preview-scanner:test
• ANDROID_HOME=$HOME/Library/Android/sdk build-brief ./gradlew -p samples/android-compose-app :app:captureComposePreviews
• ANDROID_HOME=$HOME/Library/Android/sdk build-brief ./gradlew -p samples/cmp-compose-app :composeApp:captureComposePreviews
• VLR focused smoke:
  • ANDROID_HOME=$HOME/Library/Android/sdk build-brief --mode raw ./gradlew --no-configuration-cache :designsystem:captureComposePreviews -PagentPreview.previewNameFilter=PrismButtonPreview -PagentPreview.maxPreviewParameterValues=1 -PagentPreview.viewportFilter=phone --console=plain

VLR result

Captured one item in ~9s:

Captured :designsystem:main:dev.staticvar.designsystem.component.button.PrismButtonPreview:previewParam-0 (android-phone) via robolectric
AgentPreview capture: discovered 28, expanded 1, selected 1, captured 1 viewport(s), skipped preview filters 27, viewport filters 1.

Review

• Implementation delegated to subagent
• Review subagent found shorthand previewParam-N prefilter issue
• Fix delegated to subagent
• Re-review approved with no findings