feat: add Router, Stream NFT, and Paymaster clients

[Utilitycoder]

Summary

• add optional Router, Stream NFT, and Paymaster capability groups
• introduce chain-neutral NFT and sponsored-call input types
• normalize NFT reads and validate fee bounds and contract inputs
• remove generated binding browser-global mutations
• document prerelease gates

Verification

• 4 test files passed
• 12 tests passed
• typecheck and build passed

Before release

• regenerate Router, Stream NFT, and Paymaster bindings from clean tagged contract artifacts
• add deployed testnet integration coverage

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 52f82b9d-5444-4380-a08f-4bcadab818fa

📥 Commits

Reviewing files that changed from the base of the PR and between 8dcb19a and 30c0a50.

⛔ Files ignored due to path filters (3)

• src/generated/paymaster/src/index.ts is excluded by !**/generated/**
• src/generated/router/src/index.ts is excluded by !**/generated/**
• src/generated/stream_nft/src/index.ts is excluded by !**/generated/**

📒 Files selected for processing (12)

• README.md
• docs/router-paymaster.md
• src/core/types.ts
• src/stellar/client.test.ts
• src/stellar/client.ts
• src/stellar/flow-client.ts
• src/stellar/index.ts
• src/stellar/paymaster-client.ts
• src/stellar/protocol-clients.test.ts
• src/stellar/router-client.ts
• src/stellar/stream-nft-client.ts
• src/stellar/validation.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/router-nft-paymaster

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