Implement Reveal Validation and Phase Checks

[popsman01]

Description
Build reveal preconditions so only active committed games can be revealed with valid commitment material.

Motivation
This functionality is a required building block for the Tossd game flow. Without it, dependent features cannot be built or tested correctly.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Primary files: Tossd-contract/src/lib.rs

Proposed Solution
Complete the following in a focused PR off feature/reveal-validation:

• Implement reveal guard clauses
• Verify current phase and active game presence
• Document reveal preconditions

Technical Implementation

Files to modify:

• coinflip-contract/src/lib.rs

Implementation steps:

• Implement reveal guard clauses
• Verify current phase and active game presence
• Document reveal preconditions

Branch: feature/reveal-validation

Example commit message

feat: implement reveal validation and phase checks

Acceptance Criteria

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

Guidelines

• Assignment required before starting
• PR description must include: Closes #116

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