AEL v0.13.0 Public Devnet

First public AEL agent-native blockchain devnet prerelease. Includes the deterministic node/gateway package, SPDX 2.3 SBOM, source audit manifest, 21 mainnet phase gates, consent-gated wallet packages, and the agent integration skill. This is intentionally a development-network release, not a mainnet or investment claim. Reproducible archive SHA-256: 6057f0a56658045cc30039e2d24170faf5a8cb92e60c6bd3bbe99d1a3d1fc2a3. Run npm test, npm run scan-secrets, and npm run verify-reproducible from the tagged source to verify the implementation and release.