misc. improvements and fixes

[dcrawbuck]

Note

• SDK docs expanded: New changelog.mdx for android, expo, and flutter with latest release notes; wired into each SDK’s meta.json.
• API references: Adds getPresentationResult() pages for Android and Expo; enhances Superwall refs for Android and Flutter with reset guidance.
• New guides: Expo locale override and StoreKit testing; Flutter Superwall Deep Links and StoreKit testing; retitles Expo deep link doc.
• Dashboard docs: Placements page adds parameter usage section; Standard Placements clarifies deep link param fields and headings; small Google Play revenue tracking step clarification.
• Agent/dev docs: Rewrites AGENTS.md with rules/commands; update-sdk-docs command notes mirroring changelogs; replaces CLAUDE.md with pointer; removes obsolete .claude/ and .cursor/commands/* files.

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