Fix out-of-memory error during wayfinder:generate on a cold cache

[alaminfirdows]

Description

wayfinder:generate fatal-errors with Allowed memory size of 134217728 bytes exhausted when run against a cold cache (empty storage/wayfinder-cache) under PHP's default 128M memory limit (see #167).

The static analysis pass (via laravel/surveyor) retains every analyzed scope in memory for the duration of the walk, and that working set exceeds 128M for non-trivial applications on a first run. The command then dies mid-generation instead of producing output.

This change lifts the memory limit for the wayfinder:generate command when it has been capped. It is a build-time, short-lived CLI process (the same approach used by Composer and other code-generation tools), so removing the cap is safe and lets generation complete reliably regardless of application size.

Closes #167

Benefit to end users

Users can run php artisan wayfinder:generate (directly, or via the Vite plugin during npm run build) under the default PHP memory configuration without hitting a fatal out-of-memory error on a cold cache.

Non-breaking changes

• The limit is only ever raised, never lowered. If the environment already sets memory_limit = -1, the command is a no-op.
• ini_set is suppressed, so environments that forbid changing the limit at runtime fall back to the previous behavior rather than erroring.
• No generated output or public API changes.

Tests

Added test_generate_completes_under_default_memory_limit, which runs wayfinder:generate in a subprocess constrained to memory_limit=128M and asserts it succeeds. This fails before the change (fatal OOM) and passes after. The existing GenerateCommandTest suite and the Vitest globalSetup build (which runs wayfinder:generate at the default limit) also complete under 128M with this change.

[github-actions]

Thanks for submitting a PR!

Note that draft PRs are not reviewed. If you would like a review, please mark your pull request as ready for review in the GitHub user interface.

Pull requests that are abandoned in draft may be closed due to inactivity.

[joetannenbaum]

Thank you!