Align SDK commons contract to v1.1.0

[GsCommand]

Motivation

• Consolidate the SDKs on a single Canonical Commons v1.1.0 story (receipt-first, non-payment-aware) and remove lingering 1.0-era / x402-first assumptions.
• Ensure Commons surfaces do not emit or teach payment metadata and that Commercial/x402 remains explicitly separate/legacy.
• Make verification and parse flows match current runtime expectations (canonicalization, signature checks, and schema usage).

Description

• Removed automatic x402 request metadata from Commons client payloads and marked x402 in the TypeScript receipt type as legacy/commercial-only, so Commons calls emit only actor + body.
• Updated parse helpers to prefer the current-line schema field and accept legacy targetSchema/target_schema as a compatibility alias.
• Relaxed verification semantics so metadata.receipt_id is treated as optional/opaque instead of required to mirror the hash, while preserving cl-stable-json-v1 canonicalization, SHA-256 recompute, and Ed25519 signature verification.
• Regenerated test vectors (public key, expected hash, receipts) and updated unit/integration tests and examples/docs/quickstart/README to consistently present the v1.1.0 Commons vs Commercial story.

Testing

• Ran TypeScript package tests: cd typescript-sdk && npm test — all unit and CLI smoke checks passed (41 passed, 0 failed).
• Ran Python package tests: cd python-sdk && pytest — test suite passed (24 passed, 1 warning).
• Added tests asserting Commons payloads omit x402 and that parse uses schema; updated verification parity tests to validate new fixtures.

Breaking changes

• Commons request payloads no longer include x402 (integrations that expected SDK-emitted x402 must move that behavior to an explicit commercial flow or add it themselves).
• Canonical Commons examples/fixtures no longer include x402 or require metadata.receipt_id.
• parse() helpers now prefer schema (legacy targetSchema/target_schema accepted as alias).

SDK now reflects the v1.1.0 current-line system

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Codex Task