Release process: semver tags and changelog for WASM

[greatest0fallt1me]

Description

Define tagging vX.Y.Z, changelog entry per release, and WASM artifact guidance.

Requirements and context

• Align with Stellar ecosystem norms.
• Document in README.

Suggested execution

• Fork the repository and create a branch (example below).
• Implement the changes in the StreamPay-Contracts Soroban crate (streampay-contracts).
• Keep the contract secure, tested, and documented; prefer small, reviewable diffs.

git checkout -b docs/release-process-contracts

Implementation targets

• docs/RELEASE.md.
• Optional GitHub release template.

Tests and validation

• Add or extend contract tests for this scope.

• Cover edge cases; paste summarized test output and security notes in the PR.

• Run cargo test in StreamPay-Contracts.

• Cover edge cases; capture test output and short security notes in the PR description.

Guidelines

• Target minimum 95% test coverage for touched contract code (or justify gaps explicitly).
• Clear documentation (rustdoc / project docs as specified).
• Timeframe: 96 hours from assignment.

Example commit message

docs(contracts): release and changelog process for WASM

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