Reapply PR #38 TypeScript/Python parity fixes and add PR #39 template-suite discovery

[GsCommand]

Motivation

• Restore the cross-SDK contract/typing and verification fixes that were introduced in PR Combine TS fixes from PR #35 and apply Python fixes from PR #37 #38 so TypeScript and Python behave the same way on canonical receipts and verification.
• Keep only the test-runner discovery change from PR Fix TypeScript template test discovery for optional runtime suite #39 so the runtime template test suite is treated as optional while the TypeScript suite remains required.
• Ensure parity checks and unit/integration tests all pass before finalizing the combined change set.

Description

• TypeScript: align request envelope and verification types in typescript-sdk/src/index.ts, returning Commons requests without the legacy x402 envelope while preserving x402 for commercial requests, add ReceiptProtocolMetadata, fix getReceiptVerb to handle legacy success-summary fallback, wire receipt_id_present and signer id correctly, and update unit expectations in typescript-sdk/scripts/unit-tests.mjs.
• Template runner: replace the glob-runner with file discovery in typescript-sdk/scripts/template-tests.mjs so runtime/tests is optional and typescript-sdk/tests is required, and run each suite with explicit node --test <files...> invocation.
• Python: reapply PR#38 fixes in python-sdk/commandlayer/client.py, python-sdk/commandlayer/verify.py, and python-sdk/commandlayer/types.py to mirror the TypeScript contract (Commons requests omit x402, commercial requests include x402, normalize legacy responses, add verb/receipt_id_present typing, and extend extract_receipt_verb to fallback to legacy success-summary fixtures).
• Tests and test expectations updated: adjusted Python unit tests in python-sdk/tests/test_public_api.py and python-sdk/tests/test_client.py and TypeScript unit tests in typescript-sdk/scripts/unit-tests.mjs to reflect the current Commons shape and the template-runner behavior.

Testing

• Ran TypeScript full test suite with cd typescript-sdk && npm test, which completed successfully (unit tests, template tests and CLI smoke tests all passed).
• Ran Python tooling and tests with cd python-sdk && python -m ruff check . && python -m mypy commandlayer && python -m pytest tests -q, which completed successfully (lint, type-check, and pytest all passed).
• Ran cross-SDK parity with node scripts/parity-check.mjs, which passed and shows TypeScript and Python agree on shared verification semantics.
• All automated checks executed locally completed successfully.

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