Tests: Add PHPUnit tests for hook, WP, and bidirectional functions #325
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What
Part of #315.
Adds PHPUnit test coverage for hook, WordPress wrapper, and bidirectional functions.
Why
These functions handle critical WordPress hook management (filter/action variations, deprecated hook bridging), object type resolution, and bidirectional field relationships.
How
Adding 109 tests covering:
Testing Instructions
Run the test suite:
./vendor/bin/phpunit --filter "Test_ACF_Hook_Functions|Test_ACF_WP_Functions|Test_ACF_Bidirectional_Functions"