chore: release @zkp2p/cash 0.5.3

[ADWilkinson]

Release the SDK 0.14.1 adoption from #75 as Cash 0.5.3. This changes only the package version, following the repository release contract; no public API changes.

Validation: #75 passed the full local gate and GitHub CI, including 338 tests and packed compatibility checks, with clean independent review. Release CI passed in run 34347984091 (full bun run ci). The diff was reviewed: only version 0.5.2 → 0.5.3. After merge, the clean release commit will be verified and published, then adopted by the CLI and affected consumers.

Published @zkp2p/cash 0.5.3 from merge commit 3bdbe01 after a clean frozen install and full release preflight. Registry latest is 0.5.3 and downloaded tarball integrity matches the immutable preflight artifact. The initial registry proof lagged publication; read-only reconciliation succeeded without a second publish.

[ADWilkinson]

Post-merge cascade complete for 3bdbe0135fde8958b3d8336556ef9319b8e5ea1d.

• GitHub confirms chore: release @zkp2p/cash 0.5.3 #76 merged into default branch main; the only change is package version 0.5.2 → 0.5.3.
• Full CI passed on the exact merge commit.
• Source-only: Peer Cash has no mapped release environment; no deployment or release-branch sync applies. npm publication is a separate release step.
• Verified announcement in the existing Cash update thread.

Cascade receipt: merge-cascade:zkp2p/peer-cash#76:3bdbe013