CONV-250: Create SubscriptionWebhookHandler skeleton

[menvil]

Summary

• Created SubscriptionWebhookHandler with three skeleton methods: handleSubscriptionActivated, handleSubscriptionCancelled, handleInvoicePaid
• Methods throw LogicException('Not implemented yet') — implementations come in CONV-252/254/256
• Constructor injects BillingPlanRepository, CreditLedger, and BillingWebhookEventRecorder

Test plan

• Handler resolves from container
• composer test passes (452 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Set up the SubscriptionWebhookHandler skeleton to handle subscription activation, cancellation, and invoice payment events for CONV-250. This prepares the webhook pipeline and wires required dependencies; implementations will follow in CONV-252/254/256.

• New Features
  • Added SubscriptionWebhookHandler with stubs for: subscription activated, subscription cancelled, invoice paid (all throw LogicException for now).
  • Injects BillingPlanRepository, CreditLedger, BillingWebhookEventRecorder.
  • Added a unit test to ensure the handler resolves from the container.

^{Written for commit c62c98e. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-250-create-subscription-webhook-handler-skeleton

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