Refactor tab bar runtime hooks and enable strict Swift settings

[lynnswap]

Summary

Refine the internal tab bar runtime integration, enable stricter Swift package settings, and document the package testing workflow.

Changes

• add package-level testing guidance in AGENTS.md, including the simulator-based test entry point for the public UIKit package
• enable strict Swift settings in Package.swift and route Objective-C runtime bridging through ObjectiveCInterop.swift to satisfy stricter memory-safety checks
• replace UITabBar item setter interception with a layout-driven runtime bridge while preserving the More-tab selection override
• make long-press gesture synchronization idempotent, avoid duplicate recognizers across repeated layout passes, and recover the current tab index from the source view when needed
• expand tests to cover layout callbacks, item and view controller updates, repeated layout passes, RTL/LTR fallback ordering, and stale recognizer index recovery

Testing

• xcodebuild test -scheme TabBarMenu-Package -destination 'platform=iOS Simulator,name=iPhone 17,OS=latest' -parallel-testing-enabled NO -maximum-concurrent-test-simulator-destinations 1 -quiet
• codex-review --uncommitted

UI Changes

• None

Related Issues

• None

[lynnswap]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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