[W5][SDK][M] Add contract-registry schema versioning support

[kike-alt]

ID: W5-3C-SDK-003
Track: SDK
Phase: 3C
Difficulty: intermediate
Priority: P1

Description

Support registry manifest versions to safely evolve deployment metadata.

Acceptance Criteria

• Define implementation plan aligned to scope boundaries
• Implement and verify changes in soroban/sdk/ts/network.ts
• Implement and verify changes in soroban/sdk/ts/registry.ts
• Add/adjust tests or validation artifacts for the changed surface
• Update docs/notes if behavior or operations change

Relevant Files/Modules

• soroban/sdk/ts/network.ts
• soroban/sdk/ts/registry.ts

Dependencies / Blocked By

• [W5][DX][M] Add dependency map page for active Wave 5 Phase 3 issues #606
• [W5][DEVOPS][M] Add testnet deployment dry-run workflow scaffold #610

Validation Requirements

• versioned schema load tests pass for v1 and v2 examples