Final combined PR: merge #29 index.ts fixes with #30 template test fix

[GsCommand]

Motivation

• Consolidate previous separate fixes into a single combined PR branch so the TypeScript SDK src/index.ts fixes (from PR Fix PR #28: Rebase TypeScript receipt types and keep optional template-suite handling #29) and the template test runner fix (from PR Fix template test discovery without node:fs globSync #30) are delivered together.
• Ensure the template test runner does not rely on globSync from node:fs and instead enumerates test files in a portable way.

Description

• Updated typescript-sdk/src/index.ts types and plumbing by adding verb?: to CanonicalReceipt, introducing ReceiptProtocolMetadata, and aligning CommandResponse / LegacyBlendedReceipt to use CanonicalReceipt<TResult> so generics and missing type names compile.
• Fixed verification logic by introducing receiptIdPresent, mapping signer_id to the signerId local value, and changing extractReceiptVerb to use getReceiptVerb (with a default of "summarize") so verb extraction is consistent with tests.
• Reworked typescript-sdk/scripts/template-tests.mjs to use readdirSync and path to enumerate *.test.mjs files and pass explicit file paths to node --test, removed any reliance on globSync, and set a stable cwd for test runs.
• Kept changes minimal and focused on type/behavior fixes and test-runner portability without broader refactors.

Testing

• Ran cd typescript-sdk && npm run typecheck and TypeScript checks completed successfully.
• Ran cd typescript-sdk && npm run build and the package built successfully (ESM/CJS/DTS artifacts created).
• Ran cd typescript-sdk && npm run test:unit and unit + template tests passed (unit suite: 44 passed, 0 failed; template tests: all subtests passed).

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