test(caip): add tests for CAIP-2 and CAIP-19 parsing

[ak68a]

Summary

• Add 23 tests for CAIP-2: caip2Parts() parsing, all regex patterns, predefined chain ID constants
• Add 24 tests for CAIP-19: all 6 regex patterns for asset namespaces, references, types, and IDs

Both modules had zero test coverage. These are leaf-level utilities that the identity and payment stack builds on — did:pkh resolution depends on CAIP-2 parsing, and payment options reference assets via CAIP-19.

Test plan

• All 96 CAIP tests pass (47 existing + 49 new)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5c63ee3d-7ad7-44bc-a236-41628af9931c

📥 Commits

Reviewing files that changed from the base of the PR and between f0e8c6c and 526b3ed.

📒 Files selected for processing (2)

• packages/caip/src/caips/caip-19.test.ts
• packages/caip/src/caips/caip-2.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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