Add plugin rule suggestions

[blessdyb]

Summary

• add inert suggested Flowlight rules to plugin findings alongside guardrail suggestions
• gate JavaScript enforcement suggestions on the suggestGuardrail capability and permission
• route Add Rule/Add Guardrail through the existing stores so plugins remain advisory
• update template validation and plugin docs for suggestedRule

Verification

• node templates/inspection-plugin/validate.js
• python3 scripts/i18n_extract.py --check
• python3 scripts/check_site.py
• xcodebuild test -quiet -project Flowlight.xcodeproj -scheme Flowlight -destination 'platform=macOS' -only-testing:FlowlightTests/PluginTests CODE_SIGN_IDENTITY=- CODE_SIGN_STYLE=Manual DEVELOPMENT_TEAM= CODE_SIGN_ENTITLEMENTS=
• xcodebuild test -quiet -project Flowlight.xcodeproj -scheme Flowlight -destination 'platform=macOS' -only-testing:FlowlightTests/LocalizationTests CODE_SIGN_IDENTITY=- CODE_SIGN_STYLE=Manual DEVELOPMENT_TEAM= CODE_SIGN_ENTITLEMENTS=
• xcodebuild -project Flowlight.xcodeproj -scheme Flowlight -derivedDataPath build CODE_SIGN_IDENTITY=- CODE_SIGN_ENTITLEMENTS= CODE_SIGN_STYLE=Manual DEVELOPMENT_TEAM= test (666 tests)
• launched build/Build/Products/Debug/Flowlight.app and confirmed the debug process started

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