Expand architecture and core behavior tests

[jbrooksuk]

Summary

• fix CommandsTest so it targets the real Cachet\Commands namespace
• add Pest architecture coverage for filters, MCP tools, notifications, query builders, renderers, and settings
• add behavioral coverage for webhook dispatch, flexible date casting, and model metadata lifecycle

Testing

• php84 -d memory_limit=512M vendor/bin/pest tests/Architecture tests/Unit/Actions/Webhook/DispatchWebhooksTest.php tests/Unit/Data/FlexibleDateTimeCastTest.php tests/Unit/Models/HasMetaTest.php --compact (38 passed, 78 assertions)
• php84 vendor/bin/pint --test tests/Architecture tests/Unit/Actions/Webhook/DispatchWebhooksTest.php tests/Unit/Data/FlexibleDateTimeCastTest.php tests/Unit/Models/HasMetaTest.php
• Full suite attempted: 986 passed and 2 todo; 49 rendering tests fail because the Testbench fixture cannot find its published Vite manifest.

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