docs(project): record completed history evidence

docs/tests/integration/projects-completed-history.md

@@ -0,0 +1,77 @@
+# Test Evidence: Completed Project member and Task history
+
+- **Test type:** Integration
+- **Requirement IDs:** `AUTH-006`, `PRJ-014`
+- **Scenario IDs:** `AC-AUTH-007`
+- **Test class/method:** `com.lab.labtimesheet.feature.project.service.ProjectServiceIntegrationTest#completedProjectQueriesReturnHistoricalMembersWithoutRequiringACurrentLeader`
+- **Implementation commit:** `3d954dd`
+
+## Protected behavior
+
+After Project completion closes every membership and leadership interval, a historical member can still retrieve read-only Task context and member history. The Task context reports no current Leader and no active members, and every historical member row reports `currentLeader=false`.
+
+## Test method
+
+The Spring Boot integration test creates a Project and second member through public Project services, then uses direct SQL only as a fixture to reproduce the Iteration 2 completion result: all leadership and membership intervals are closed and the Project is marked `COMPLETED`. After clearing the persistence context, it calls the public Project query APIs as the former member and checks the DTOs.
+
+## Hand-derived expected result
+
+A completed Project cannot have a current Leader or active member. Therefore `ProjectTaskContext.currentLeaderMembershipId` is `null`, `activeMembers` is empty, both membership-history rows remain visible, both have leave timestamps, and neither is marked as current Leader.
+
+## RED
+
+**Command**
+
+```text
+export JAVA_HOME=/opt/homebrew/opt/openjdk@25
+export PATH="$JAVA_HOME/bin:$PATH"
+export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
+./mvnw -Dtest=ProjectServiceIntegrationTest#completedProjectQueriesReturnHistoricalMembersWithoutRequiringACurrentLeader test
+```
+
+**Observed result**
+
+```text
+[ERROR] ProjectRuleViolationException: Project has no current Leader
+    at com.lab.labtimesheet.feature.project.model.entity.ProjectEntity.currentLeader(ProjectEntity.java:232)
+    at com.lab.labtimesheet.feature.project.service.ProjectQueryService.taskContext(ProjectQueryService.java:113)
+[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0
+[INFO] BUILD FAILURE
+```
+
+## GREEN
+
+**Command**
+
+```text
+export JAVA_HOME=/opt/homebrew/opt/openjdk@25
+export PATH="$JAVA_HOME/bin:$PATH"
+export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
+./mvnw -Dtest=ProjectServiceIntegrationTest#completedProjectQueriesReturnHistoricalMembersWithoutRequiringACurrentLeader test
+```
+
+**Observed result**
+
+```text
+[INFO] Running com.lab.labtimesheet.feature.project.service.ProjectServiceIntegrationTest
+[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"
+export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
+./mvnw -Dtest='Project*Test' test
+
+[INFO] Tests run: 21, Failures: 0, Errors: 0, Skipped: 0
+[INFO] BUILD SUCCESS
+```
+
+## External-test boundaries
+
+This regression proves completed-state DTO behavior against PostgreSQL 18.4. It does not implement or test the future Project-completion mutation itself, browser rendering, or Task-owned authorization and presentation; direct SQL is confined to constructing the completed aggregate fixture.