Intent security skill

[sabs231]

Add intent security skill

[gemini-code-assist]

Code Review

This pull request introduces a new skill document, SKILL.md, outlining security best practices and code patterns for Android Intents and components. The reviewer provided valuable feedback addressing several technical inaccuracies in the guidelines: replacing the deprecated LocalBroadcastManager with modern in-app observers like Kotlin Flows or LiveData, correcting the usage of Binder.getCallingUid() which returns a UID rather than a package name directly, and noting that Binder.getCallingUid() cannot be used inside BroadcastReceiver.onReceive() to verify a sender's identity, suggesting protected system broadcasts or signature-level permissions instead.

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