Feat/subscription delegation update

[tuna1207]

Explanation

Adds SubscriptionDelegationService:startSubscriptionWithDelegation, providing a single-approval subscription checkout flow that:

• Combines Money Account vault permissions with the recurring subscription permission.
• Creates an immutable, fingerprinted authorization bundle for confirmation.
• Requests MM Pay funding through ApprovalController.
• Ensures Money Account delegation readiness after approval.
• Signs, validates, persists, and registers the subscription delegation.
• Verifies that CHOMP reports the intent as active before creating the subscription.
• Reuses compatible existing delegations where possible.
• Revalidates trial eligibility before subscription creation.

This also:

• Adds temporary local Money Account readiness contracts until the owning package exports them.
• Adds canonical EIP-712 typed-data construction, hashing, authority decoding, and bundle fingerprinting.
• Wires the required actions into the wallet initialization messenger.
• Adds Approval Controller, signature utility, and hashing dependencies.
• Expands unit coverage for approval validation, readiness changes, delegation reuse, CHOMP failures, and trial eligibility changes.

The authorization bundle is sent to confirmations so the complete effective permission set can be displayed. The local assertTrialEligibility guard is removed before the backend request.

References

• Subscription delegation signing and confirmation architecture contract: https://docs.google.com/document/d/1caawCgJFoRYVZ9yZuRscLuG7ez7RWvAFLNUu_Qim9uY/edit?tab=t.0#heading=h.36v515jilmbd

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating the package changelog
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them