feat: align runtime-core v1.1.0 protocol implementation

[GsCommand]

Motivation

• Consolidate the canonical protocol implementation and lock the v1.1.0 signing/ENS contract so downstream repos import a single source of truth.
• Switch signing to raw canonical UTF-8 bytes (not sha256 hex) and standardize ENS key encoding and proof field names per protocol audit findings.
• Remove tracked build artifacts (dist/) and provide CI to enforce typecheck/build/test on push/PR.

Description

• Replace and rework core modules: add src/canonicalize.ts for json.sorted_keys.v1, overhaul src/crypto.ts to expose PROTOCOL_VERSION, CANONICAL_METHOD, SIGNATURE_ALG, encodePublicKey, parsePublicKey, signCanonical, verifyCanonical, verifyCanonicalWithRawKey, and generateEd25519KeyPair using standard base64 and raw UTF-8 signing.
• Update src/ens.ts to strictly resolve ENS text records and hard-fail on missing/malformed records, returning a typed EnsSignerRecord and convenience resolvePublicKeyFromENS wrapper.
• Replace src/receipt.ts with v1.1.0 layered receipt builder/verifier using proof fields alg, kid, signer_id, canonical, and signature, plus signReceipt, verifyReceipt, and isSignedLayeredReceipt APIs that validate structure and verification checks.
• Update public exports in src/index.ts, add test suites under test/ for canonicalize/crypto/receipt, add GitHub Actions CI workflow .github/workflows/ci.yml, and ensure dist/ is untracked.

Testing

• Ran bash DELETIONS.sh to clear tracked build artifacts successfully.
• Attempted npm install but it failed in this environment with a registry 403 Forbidden error so dependencies were not installed.
• Attempted npm run build and npm run typecheck and both surfaced TypeScript errors in remaining project sources (missing/updated exports), so the compile/typecheck did not succeed.
• Attempted npm test but it failed due to missing runtime test helper (tsx/esm) which could not be installed without a successful npm install, so the newly added tests were not executed here.

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Codex Task