authCapture: drop unused MAX_UINT exports + rename stale test fixtures

- Remove MAX_UINT48 / MAX_UINT32 from shared/constants.ts — exported
  but never imported anywhere.
- Rename `escrowAddress` / `operatorAddress` in server.test.ts merge
  fixtures to opaque keys. The merge logic in
  enhancePaymentRequirements is key-agnostic, and the old names were
  commerce-era artifacts that no longer reflect the wire format
  (escrow address is a constant; operatorAddress is now
  captureAuthorizer at the wire layer).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: A1igator

packages/evm/src/authCapture/shared/constants.ts

@@ -1,6 +1,3 @@
-export const MAX_UINT48 = 281474976710655
-export const MAX_UINT32 = 4294967295
-
 // Canonical AuthCaptureEscrow + token collector deployments from
 // base/commerce-payments@v1.0.0 (https://github.com/base/commerce-payments).
 // Redeployed 2026-04-29 via CreateX with deterministic permissionless salts

packages/evm/test/unit/authCapture/server.test.ts

@@ -198,16 +198,16 @@ describe('AuthCaptureServerScheme', () => {
         scheme: 'authCapture',
         network: 'eip155:84532' as const,
         extra: {
-          escrowAddress: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
-          operatorAddress: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+          fromSupported1: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+          fromSupported2: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
         },
       }
 
       const result = await scheme.enhancePaymentRequirements(requirements, supportedKind, [])
 
       expect(result.extra).toEqual({
-        escrowAddress: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
-        operatorAddress: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+        fromSupported1: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+        fromSupported2: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
       })
     })
 
@@ -231,14 +231,14 @@ describe('AuthCaptureServerScheme', () => {
         scheme: 'authCapture',
         network: 'eip155:84532' as const,
         extra: {
-          escrowAddress: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+          fromSupported: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
         },
       }
 
       const result = await scheme.enhancePaymentRequirements(requirements, supportedKind, [])
 
       expect(result.extra).toEqual({
-        escrowAddress: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+        fromSupported: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
         customField: 'custom-value',
       })
     })
@@ -254,7 +254,7 @@ describe('AuthCaptureServerScheme', () => {
         payTo: '0x1234567890123456789012345678901234567890',
         maxTimeoutSeconds: 300,
         extra: {
-          escrowAddress: '0xcccccccccccccccccccccccccccccccccccccccc',
+          sharedKey: '0xcccccccccccccccccccccccccccccccccccccccc',
         },
       }
 
@@ -263,14 +263,14 @@ describe('AuthCaptureServerScheme', () => {
         scheme: 'authCapture',
         network: 'eip155:84532' as const,
         extra: {
-          escrowAddress: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+          sharedKey: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
         },
       }
 
       const result = await scheme.enhancePaymentRequirements(requirements, supportedKind, [])
 
       // Requirements extra should override supportedKind extra
-      expect(result.extra?.escrowAddress).toBe('0xcccccccccccccccccccccccccccccccccccccccc')
+      expect(result.extra?.sharedKey).toBe('0xcccccccccccccccccccccccccccccccccccccccc')
     })
 
     it('should preserve all original requirement fields', async () => {