test(project_registry): add unit tests for issues #196, #197, #198, and #199

[nomsoscript]

Closes #196
Closes #197
Closes #198
Closes #199

Description

This PR addresses four assigned unit test issues in \project_registry:

1. Issue Add unit test for create_project() rejecting an empty URI #196 - Create project with empty URI: Added \ est_create_project_empty_uri_panics\ to verify that \create_project()\ rejects an empty URI string with \RegistryError::UriTooShort.
2. Issue Add unit test verifying certify_project() rejects certifying an already-certified project #197 - Re-certifying an already-certified project: Added \AlreadyCertified\ error variant and updated \certify_project()\ to panic if a project is already certified with the target status. Added \ est_certify_already_certified_project_panics.
3. Issue Add unit test for liquidate_collateral() rejecting liquidation before maturity #198 - Liquidate collateral before maturity: Updated \liquidate_collateral_internal()\ to check maturity date and reject liquidation attempt prior to project maturity date with \RegistryError::ProjectNotMature. Added \ est_liquidate_collateral_before_maturity_panics.
4. Issue Add unit test verifying deposit_collateral() rejects a zero-amount deposit #199 - Deposit zero-amount collateral: Added \ est_deposit_zero_collateral_panics\ to verify \deposit_collateral()\ rejects zero-amount deposits with \RegistryError::CollateralNotPositive.

Changes

• Modified \project_registry/src/types.rs: Added \AlreadyCertified\ variant (38) to \RegistryError.
• Modified \project_registry/src/lib.rs: Added duplicate certification guard to \certify_project()\ and pre-maturity liquidation check to \liquidate_collateral_internal().
• Modified \project_registry/src/test.rs: Added unit test cases for empty URI, duplicate certification, pre-maturity liquidation rejection, and zero collateral deposit.

Testing

• Unit tests added under \project_registry/src/test.rs\ covering all negative cases.

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