docs(project): record feature JPA milestone evidence

docs/tests/unit/projects-domain.md

@@ -3,8 +3,8 @@
 - **Test type:** Unit
 - **Requirement IDs:** `PRJ-001`–`PRJ-007`, `PRJ-012`, `PRJ-017`, `AUTH-001`–`AUTH-004`
 - **Scenario IDs:** `AC-PRJ-001`, `AC-PRJ-003`, `AC-PRJ-006`, `AC-PRJ-009`
-- **Test class/method:** `com.lab.labtimesheet.projects.domain.ProjectTest`
-- **Implementation commit:** `3483347`
+- **Test class/method:** `com.lab.labtimesheet.feature.project.model.entity.ProjectEntityTest`
+- **Implementation commit:** `25a855e`
 
 ## Protected behavior
 
@@ -43,13 +43,13 @@ export PATH="$JAVA_HOME/bin:$PATH"
 ```text
 export JAVA_HOME=/opt/homebrew/opt/openjdk@25
 export PATH="$JAVA_HOME/bin:$PATH"
-./mvnw -Dtest=ProjectTest test
+./mvnw -Dtest=ProjectEntityTest test
 ```
 
 **Observed result**
 
 ```text
-[INFO] Running com.lab.labtimesheet.projects.domain.ProjectTest
+[INFO] Running com.lab.labtimesheet.feature.project.model.entity.ProjectEntityTest
 [INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS
 ```
@@ -61,7 +61,7 @@ export PATH="$JAVA_HOME/bin:$PATH"
 ```text
 export JAVA_HOME=/opt/homebrew/opt/openjdk@25
 export PATH="$JAVA_HOME/bin:$PATH"
-./mvnw -Dtest=ProjectTest test
+./mvnw -Dtest=ProjectEntityTest test
 
 [INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS

docs/tests/unit/projects-layer-structure.md

@@ -0,0 +1,75 @@
+# Test Evidence: Project layer and JPA structure
+
+- **Test type:** Unit
+- **Requirement IDs:** `ARC-002`, `ARC-005`–`ARC-007`, `OPS-018`–`OPS-020`, `TST-001`–`TST-010`
+- **Scenario IDs:** `I1-PRJ-01`–`I1-PRJ-05`
+- **Test class/method:** `com.lab.labtimesheet.feature.project.repository.ProjectPersistenceStructureTest#projectPersistenceUsesTheRequiredLayerPackagesAndSpringDataJpa`
+- **Implementation commit:** `25a855e`
+
+## Protected behavior
+
+Project-owned production code follows the authoritative feature-first package layout, persists aggregate entities through Spring Data JPA, keeps JDBC operations out of Project business services, and does not shadow Account or Task persistence.
+
+## Test method
+
+Plain JUnit inspects the public Project entity, repository, and service types. It verifies their exact feature/layer packages, the entity's JPA mapping, the repository's `JpaRepository` contract, the absence of JDBC service dependencies, and the absence of foreign-table Account/Task shadow entities.
+
+## Hand-derived expected result
+
+The Project aggregate is under `feature.project.model.entity`, persistence under `feature.project.repository`, business logic under `feature.project.service`, the service has zero JDBC collaborators, and Account/Task persistence remains owned by those features.
+
+## RED
+
+**Command**
+
+```text
+export JAVA_HOME=/opt/homebrew/opt/openjdk@25
+export PATH="$JAVA_HOME/bin:$PATH"
+./mvnw -Dtest=ProjectPersistenceStructureTest test
+```
+
+**Observed result**
+
+```text
+[ERROR] cannot find symbol: class ProjectUserRepository
+[ERROR] cannot find symbol: class ProjectInternProfileRepository
+[ERROR] cannot find symbol: class ProjectTaskRepository
+[INFO] BUILD FAILURE
+```
+
+The RED was observed after removing Project-owned shadow mappings of Account and Task tables. It proves the service still required cross-feature dependencies and could not be made green by retaining forbidden repositories.
+
+## GREEN
+
+**Command**
+
+```text
+export JAVA_HOME=/opt/homebrew/opt/openjdk@25
+export PATH="$JAVA_HOME/bin:$PATH"
+./mvnw -Dtest=ProjectPersistenceStructureTest test
+```
+
+**Observed result**
+
+```text
+[INFO] Running com.lab.labtimesheet.feature.project.repository.ProjectPersistenceStructureTest
+[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
+[INFO] BUILD SUCCESS
+```
+
+## Affected suite
+
+**Command and result**
+
+```text
+export JAVA_HOME=/opt/homebrew/opt/openjdk@25
+export PATH="$JAVA_HOME/bin:$PATH"
+./mvnw -Dtest=LayerStructureTest,ProjectPersistenceStructureTest,ProjectEntityTest test
+
+[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0
+[INFO] BUILD SUCCESS
+```
+
+## External-test boundaries
+
+This check does not prove database mappings, transaction behavior, MVC routing, or runtime authorization; those remain covered by PostgreSQL and MockMvc tests.