Cast retention and batch size to int for Laravel 13 compatibility

[b7s]

Summary

Fixes the CloudWatch channel failing silently on Laravel 13 (and 11/12) when the channel is configured with environment variables, as documented in the readme.

Problem

env() always returns strings, so when CLOUDWATCH_LOG_RETENTION_DAYS / CLOUDWATCH_LOG_BATCH_SIZE are set (e.g. retention => '14'), the values are passed as strings to PhpNexus\Cwh\Handler\CloudWatch::__construct(), which strictly types them as int|null $retention and int $batchSize. This throws a TypeError.

On Laravel 12+, LogManager::get() wraps channel creation in a try/catch and silently swaps in the emergency logger when a driver factory throws. The result: the channel resolves, Log::channel('cloudwatch') appears to work, but log records go to the default stream handler instead of CloudWatch — no exception is ever surfaced.

Changes

• src/Logger.php
  • Cast retention to (int) (falls back to 14 when empty/unset)
  • Cast batch_size to (int) (falls back to 10000 when empty/unset)
  • Guard the credentials key lookup with ?? null so a missing credentials config no longer emits an undefined-array-key warning
• tests/LoggerTest.php
  • Regression test covering string values sourced from env()

Testing

• vendor/bin/phpunit — 6 tests, 15 assertions, OK (PHP 8.4.22, laravel/framework ^13.0)
• Verified end-to-end in a real Laravel 13 app: Log::channel('cloudwatch') now resolves the PhpNexus\Cwh\Handler\CloudWatch handler with the configured formatter and logs without error.

Ref: open issue #61 (Laravel 13 support is merged but unreleased); this makes the documented env-var configuration actually work on the supported framework versions.