Add Grace Period Extension After Maturity

[mikewheeleer]

Implement Post-Maturity Grace Window for Settlement

Description

Allow a configurable grace period after maturity during which settlement remains allowed, with explicit documentation of buyer and investor expectations.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review

Suggested execution

• Fork the repo and create a branch
• git checkout -b feature/escrow-grace-period-settlement
• Implement changes
• Write contract: escrow/src/lib.rs
• Write comprehensive tests: escrow/src/test.rs
• Add documentation: README.md
• Include Rust doc comments for grace bounds and governance changes
• Validate assumptions against premature default handling

Test and commit

• Run tests
• Cover edge cases
• Include test output and security notes

Example commit message

feat(escrow): add post-maturity grace window for settlement

Guidelines

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours

[Sadeequ]

@Sadeequ has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

You can also lay this issue on me Sir... working on the other issue already... thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Sadeequ to this issue.