Fix PR #28: Rebase TypeScript receipt types and keep optional template-suite handling

[GsCommand]

Motivation

• Restore and align TypeScript receipt surface to the latest SDK changes so verification and request-envelope types match the commons contract.
• Preserve the template test-suite fix that made the SDK test suite optional when no tests exist, without reverting high-level API work.

Description

• Added ReceiptProtocolMetadata and wired it into CommonsRequestEnvelope and CommercialRequestEnvelope so x402/receipt metadata is explicitly typed.
• Converted CanonicalReceipt to CanonicalReceipt<TResult, TError> and propagated the generic result/error typing to CommandResponse and LegacyBlendedReceipt for consistent typings.
• Fixed verification internals: compute hashMatches explicitly, compute receipt_id_present correctly, use signerId internally and map it to values.signer_id in the VerifyResult output.
• Restored extractReceiptVerb to use shared getReceiptVerb logic and enhanced getReceiptVerb to fall back on common result-shape heuristics (e.g., summary/analysis).
• Kept and improved typescript-sdk/scripts/template-tests.mjs to skip optional suites when no matching files exist while still running required suites.

Testing

• Ran npm run typecheck in typescript-sdk and it completed successfully.
• Ran npm run build in typescript-sdk and the build completed successfully.
• Ran npm run test:unit in typescript-sdk and all unit and template tests passed (44 passed, 0 failed).

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