Add compile.view_component ActiveSupport::Notifications event for eager compilation at boot time.

[joelhawksley]

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[Copilot]

Pull request overview

This PR adds a new compile.view_component ActiveSupport::Notifications event around ViewComponent’s eager compilation that runs at boot when config.eager_load is enabled, and documents the new event.

Changes:

• Instrument eager compilation in ViewComponent::Engine with compile.view_component when Rails.application.config.eager_load is true.
• Add documentation describing the new compile-time notification and how to subscribe.
• Add a sandbox test intended to cover compile-time instrumentation.

Show a summary per file

File	Description
test/sandbox/test/instrumentation_test.rb	Adds a test intended to validate compile.view_component notifications.
lib/view_component/engine.rb	Wraps eager compilation in an ActiveSupport::Notifications.instrument("compile.view_component") block.
docs/guide/instrumentation.md	Documents the new compile-time instrumentation event and subscription example.
docs/CHANGELOG.md	Adds an entry under main announcing the new instrumentation event.

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Comments suppressed due to low confidence (1)

test/sandbox/test/instrumentation_test.rb:50

• Unsubscribing by event name here will remove all compile.view_component subscribers in the process, which can cause cross-test interference. Prefer ActiveSupport::Notifications.unsubscribe(subscriber_handle) for the specific subscription created in this test.

    ActiveSupport::Notifications.unsubscribe("compile.view_component")

• Files reviewed: 4/4 changed files
• Comments generated: 2

[Copilot]

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• Files reviewed: 4/4 changed files
• Comments generated: 1