feat(infra): remove second WalletConnect node operator from US

[xDarksome]

Description

Title

How Has This Been Tested?

Not tested

Due Diligence

• Breaking change
• Requires a documentation update
• Requires a e2e/integration test update

[claude]

Claude finished @xDarksome's task in 1m 14s —— View job

---

Review Complete

Reviewed infrastructure changes removing second WalletConnect node operator from US region.

Todo List

• Read changed Terraform file
• Analyze the diff
• Check for orphaned SOPS configuration file
• Check for other potential orphaned resources
• Complete review and report findings

---

Issues Found

Issue 1: Orphaned SOPS Configuration File
File: infra/mainnet/sops/us.wallet-connect-2.json
Problem: This SOPS configuration file still exists but is no longer referenced after removing the wallet-connect-2 operator from us_operators. The Terraform code at line 266 references sops/us.${each.key}.json, and since wallet-connect-2 is removed from the us_operators map, this file is now orphaned.

Recommendation: Delete infra/mainnet/sops/us.wallet-connect-2.json as part of this PR to complete the cleanup.

Fix this →

---

Note: VPC CIDR vpc_cidr_octet = 0 (10.0.0.0/16) previously used by the removed US operator is now used by eu_operators.wallet-connect-2. This is acceptable since VPC CIDRs only need to be unique within a region, not across regions.

---