Merge commit '2a9a1495203830ed0434649c153ee75e812ffe51' into work/reports-ui

# Conflicts:
#	src/main/resources/templates/projects/detail.html

docs/tests/integration/projects-workflows.md

@@ -1,14 +1,14 @@
 # Test Evidence: Atomic Project workflows
 
 - **Test type:** Integration
-- **Requirement IDs:** `PRJ-001`–`PRJ-007`, `PRJ-017`, `AUTH-001`–`AUTH-004`, `DB-003`, `DB-007`
+- **Requirement IDs:** `PRJ-001`–`PRJ-007`, `PRJ-012`, `PRJ-017`, `AUTH-001`–`AUTH-004`, `AUTH-011`, `DB-003`, `DB-007`
-- **Scenario IDs:** `AC-PRJ-001`–`AC-PRJ-003`, `AC-PRJ-009`
+- **Scenario IDs:** `AC-AUTH-010`, `AC-PRJ-001`–`AC-PRJ-003`, `AC-PRJ-006`, `AC-PRJ-009`
 - **Test class/method:** `com.lab.labtimesheet.feature.project.service.ProjectServiceIntegrationTest`
-- **Implementation commit:** `25a855e`
+- **Implementation commits:** `25a855e`, `dbf1202`
 
 ## Protected behavior
 
-PostgreSQL transactions persist a planned Project with its initial membership and leadership term, reject unauthorized or duplicate direct additions, change exactly one Leader without moving Task assignments, and enforce role/membership visibility without ID disclosure.
+PostgreSQL transactions persist a planned Project with its initial membership and leadership term, reject unauthorized or duplicate direct additions, change exactly one Leader without moving Task assignments, enforce role/membership visibility without ID disclosure, and activate only when current eligible membership/leadership and live-Task assignee guards pass.
 
 ## Test method
 
@@ -16,7 +16,7 @@ A Spring Boot integration test uses the platform-owned PostgreSQL 18.4 Testconta
 
 ## Hand-derived expected result
 
-Creation yields one Project, one active membership, and one current leadership term. Direct addition yields one membership per Project/Intern pair while allowing the same Intern in a second Project. Leader change yields one closed and one current term while the Task assignee ID remains unchanged. Admin, owner, and historical member visibility is allowed; unrelated IDs are denied uniformly.
+Creation yields one Project, one active membership, and one current leadership term. Direct addition yields one membership per Project/Intern pair while allowing the same Intern in a second Project. Leader change yields one closed and one current term while the Task assignee ID remains unchanged. Activation persists `ACTIVE` and `activated_at` when every live Task is assigned to a current eligible membership; a live Task assigned to a closed membership leaves the Project `PLANNED` and the Task intact. Admin, owner, and historical member visibility is allowed; unrelated IDs are denied uniformly.
 
 ## RED
 
@@ -52,10 +52,16 @@ export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
 
 ```text
 [INFO] Running com.lab.labtimesheet.feature.project.service.ProjectServiceIntegrationTest
-[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0
+[INFO] Tests run: 7, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS
 ```
 
+## Activation transaction regression
+
+**RED:** the focused PostgreSQL activation tests failed at test compilation because `ProjectService.activate(long, long)` did not exist.
+
+**GREEN:** after wiring the locked Project aggregate to Account eligibility and `TaskQueryService.countCurrentTasksAssignedOutside`, both focused activation tests passed. The valid Project became `ACTIVE`; the former-member assignee case threw `ProjectRuleViolationException`, retained `PLANNED`, and preserved its live Task.
+
 ## Affected suite
 
 **Command and result**
@@ -66,10 +72,10 @@ export PATH="$JAVA_HOME/bin:$PATH"
 export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
 ./mvnw test
 
-[INFO] Tests run: 25, Failures: 0, Errors: 0, Skipped: 0
+[INFO] Tests run: 111, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS
 ```
 
 ## External-test boundaries
 
-This test does not prove MockMvc authorization, Thymeleaf rendering, browser accessibility, real concurrent transaction races, Iteration 2 invitations/removals/completion, or Task-module business rules beyond preserving stored assignment IDs. `I1-PRJ-04` remains `IN_PROGRESS`: the activation Task-assignee guard will be implemented only after the Task feature exposes its concrete query service.
+This test does not prove MockMvc authorization, Thymeleaf rendering, browser accessibility, a two-transaction lock race, or Iteration 2 invitations/removals/completion. Task query semantics have their own Task-owned unit evidence; this integration proves Project consumes that public service boundary atomically without importing Task persistence.

docs/tests/unit/projects-domain.md

@@ -4,11 +4,11 @@
 - **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.feature.project.model.entity.ProjectEntityTest`
-- **Implementation commit:** `25a855e`
+- **Implementation commits:** `25a855e`, `dbf1202`
 
 ## Protected behavior
 
-Project creation cannot produce an empty or leaderless aggregate; direct membership rejects ineligible or duplicate current members; leadership changes leave one current term; activation is owning-Mentor-only and rejects invalid Task assignees.
+Project creation cannot produce an empty or leaderless aggregate; direct membership rejects ineligible or duplicate current members; leadership changes leave one current term; activation is owning-Mentor-only and requires an eligible active member, an eligible active current Leader, and valid current Task assignees.
 
 ## Test method
 
@@ -16,7 +16,7 @@ Plain JUnit drives the aggregate through its public factory and mutation methods
 
 ## Hand-derived expected result
 
-A planned Project starts with one current membership and one current leadership term. Adding a different eligible Intern yields two current memberships. Changing Leader closes one term and opens one term while retaining both memberships. Activation changes only `PLANNED` to `ACTIVE` when every supplied guard is true.
+A planned Project starts with one current membership and one current leadership term. Adding a different eligible Intern yields two current memberships. Changing Leader closes one term and opens one term while retaining both memberships. Activation changes only `PLANNED` to `ACTIVE` when the owning Mentor acts, the supplied active-Intern set contains a current member and the current Leader, and every Task assignee guard passes.
 
 ## RED
 
@@ -54,6 +54,12 @@ export PATH="$JAVA_HOME/bin:$PATH"
 [INFO] BUILD SUCCESS
 ```
 
+## Activation guard regression
+
+**RED:** after strengthening the aggregate test with the active-Intern set, compilation failed because `ProjectEntity.activate` still accepted only `(long, boolean, Instant)` and could not prove that the current Leader remained eligible and active.
+
+**GREEN:** after adding the active-Intern input and aggregate checks, `./mvnw -Dtest=ProjectEntityTest test` passed 6 tests with zero failures, errors, or skips.
+
 ## Affected suite
 
 **Command and result**
@@ -61,12 +67,13 @@ export PATH="$JAVA_HOME/bin:$PATH"
 ```text
 export JAVA_HOME=/opt/homebrew/opt/openjdk@25
 export PATH="$JAVA_HOME/bin:$PATH"
-./mvnw -Dtest=ProjectEntityTest test
+export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
+./mvnw -Dtest='Project*Test' test
 
-[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0
+[INFO] Tests run: 25, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS
 ```
 
 ## External-test boundaries
 
-This unit test does not prove JPA/Flyway mappings, PostgreSQL constraints or transaction concurrency, Spring Security routing, Task-module query integration, or browser rendering.
+This unit test does not prove JPA/Flyway mappings, PostgreSQL constraints or transaction concurrency, Spring Security routing, the Task query implementation, or browser rendering; those are covered at their narrower integration and web layers.

docs/tests/web/projects-pages.md

@@ -1,14 +1,14 @@
 # Test Evidence: Authorized Project pages
 
 - **Test type:** Web
-- **Requirement IDs:** `AUTH-001`, `AUTH-002`, `AUTH-006`, `PRJ-001`, `PRJ-004`–`PRJ-006`, `SEC-001`, `ERR-001`
+- **Requirement IDs:** `AUTH-001`, `AUTH-002`, `AUTH-006`, `PRJ-001`, `PRJ-004`–`PRJ-006`, `PRJ-012`, `SEC-001`, `ERR-001`
-- **Scenario IDs:** `AC-AUTH-001`, `AC-AUTH-002`, `AC-AUTH-007`, `I1-PRJ-05`
+- **Scenario IDs:** `AC-AUTH-001`, `AC-AUTH-002`, `AC-AUTH-007`, `AC-PRJ-006`, `I1-PRJ-04`, `I1-PRJ-05`
 - **Test class/method:** `com.lab.labtimesheet.feature.project.controller.ProjectControllerTest`
-- **Implementation commits:** `25a855e`, `a9ee99a`
+- **Implementation commits:** `25a855e`, `a9ee99a`, `2f25731`, `dbf1202`
 
 ## Protected behavior
 
-Authenticated users receive only authorized Project routes; guessed IDs return a non-disclosing not-found response; valid Mentor create requests use the authenticated identity; invalid forms do not mutate; state changes require CSRF.
+Authenticated users receive only authorized Project routes; guessed IDs return a non-disclosing not-found response; valid Mentor create requests use the authenticated identity; invalid forms do not mutate; the planned-Project activation action is shown only to the owning Mentor; state changes require CSRF.
 
 ## Test method
 
@@ -16,7 +16,7 @@ MockMvc exercises the real controller, binding, Bean Validation, exception mappi
 
 ## Hand-derived expected result
 
-An authorized list request renders `projects/list`. An unauthorized direct ID returns 404. Member and leadership routes authorize through actor plus Project ID. A valid create redirects to the created detail ID; a blank name and zero Leader ID render field errors and make no service call. POST without CSRF returns 403.
+An authorized list request renders `projects/list`. An unauthorized direct ID returns 404. Member and leadership routes authorize through actor plus Project ID. A valid create redirects to the created detail ID; a blank name and zero Leader ID render field errors and make no service call. An owning Mentor can submit activation and is redirected to detail; non-owners do not receive that control. POST without CSRF returns 403.
 
 ## RED
 
@@ -50,7 +50,7 @@ export PATH="$JAVA_HOME/bin:$PATH"
 
 ```text
 [INFO] Running com.lab.labtimesheet.feature.project.controller.ProjectControllerTest
-[INFO] Tests run: 6, Failures: 0, Errors: 0, Skipped: 0
+[INFO] Tests run: 10, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS
 ```
 
@@ -64,7 +64,7 @@ export PATH="$JAVA_HOME/bin:$PATH"
 export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
 ./mvnw test
 
-[INFO] Tests run: 25, Failures: 0, Errors: 0, Skipped: 0
+[INFO] Tests run: 111, Failures: 0, Errors: 0, Skipped: 0
 [INFO] BUILD SUCCESS
 ```
 
@@ -80,6 +80,12 @@ export DOCKER_HOST=unix:///Users/sechmachine/.orbstack/run/docker.sock
 
 **GREEN:** rerunning `./mvnw -Dtest=ProjectControllerTest test` after resolving the public actor view and conditionally rendering the link passed 8 tests with zero failures, errors, or skips.
 
+## Activation-route regression
+
+**RED:** the focused MockMvc run reported two expected failures: `POST /projects/30/activate` returned `404`, and the owning Mentor's planned-Project detail did not render the `Activate` action.
+
+**GREEN:** after adding the CSRF-protected POST route and owner/status-conditional Thymeleaf form, the two focused tests passed; the full `ProjectControllerTest` class passed 10 tests with zero failures, errors, or skips.
+
 ## External-test boundaries
 
-This slice does not prove PostgreSQL query correctness, a real login flow, shared-shell navigation, browser accessibility, or Iteration 2 invitation/exit/completion pages. The activation route remains deferred with `I1-PRJ-04` until the Task feature query dependency is available.
+This slice does not prove PostgreSQL query correctness, a real login flow, shared-shell navigation, browser accessibility, or Iteration 2 invitation/exit/completion pages. Server-side activation authorization and Task-assignee atomicity are covered by Project domain and PostgreSQL integration tests.

src/main/java/com/lab/labtimesheet/feature/project/controller/ProjectController.java

@@ -63,6 +63,12 @@ public class ProjectController {
         return "projects/detail";
     }
 
+    @PostMapping("/{projectId}/activate")
+    public String activate(Principal principal, @PathVariable long projectId) {
+        projects.activate(actorId(principal), projectId);
+        return "redirect:/projects/" + projectId;
+    }
+
     @GetMapping("/{projectId}/members")
     public String members(Principal principal, @PathVariable long projectId, Model model) {
         long actorId = actorId(principal);

src/main/java/com/lab/labtimesheet/feature/project/model/entity/ProjectEntity.java

@@ -21,6 +21,7 @@ import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
+import java.util.Set;
 
 @Entity
 @Table(name = "projects")
@@ -157,15 +158,23 @@ public class ProjectEntity {
                 this, change.replacement(), change.effectiveAt(), actorMentorUserId));
     }
 
-    public void activate(long actorMentorUserId, boolean allTaskAssigneesAreCurrent, Instant at) {
+    public void activate(
+            long actorMentorUserId,
+            Set<Long> activeInternUserIds,
+            boolean allTaskAssigneesAreCurrent,
+            Instant at) {
         requireOwner(actorMentorUserId);
+        Objects.requireNonNull(activeInternUserIds, "activeInternUserIds");
         Objects.requireNonNull(at, "at");
         if (status != ProjectStatus.PLANNED) {
             throw new ProjectRuleViolationException("Only a planned Project can be activated");
         }
-        if (memberships.stream().noneMatch(ProjectMembershipEntity::isCurrent)
+        if (memberships.stream().noneMatch(membership -> membership.isCurrent()
-                || leadershipTerms.stream().noneMatch(ProjectLeadershipTermEntity::isCurrent)) {
+                && activeInternUserIds.contains(membership.internUserId()))) {
-            throw new ProjectRuleViolationException("Project requires a current member and Leader");
+            throw new ProjectRuleViolationException("Project requires an active member");
+        }
+        if (!activeInternUserIds.contains(currentLeader().internUserId())) {
+            throw new ProjectRuleViolationException("Project Leader must be an active member");
         }
         if (!allTaskAssigneesAreCurrent) {
             throw new ProjectRuleViolationException("Every current Task assignee must be an active Project member");

src/main/java/com/lab/labtimesheet/feature/project/service/ProjectService.java

@@ -7,7 +7,10 @@ import com.lab.labtimesheet.feature.project.model.dto.ProjectCreateCommand;
 import com.lab.labtimesheet.feature.project.model.dto.ProjectTaskContext;
 import com.lab.labtimesheet.feature.project.model.entity.ProjectEntity;
 import com.lab.labtimesheet.feature.project.repository.ProjectRepository;
+import com.lab.labtimesheet.feature.task.service.TaskQueryService;
 import java.time.Clock;
+import java.util.Set;
+import java.util.stream.Collectors;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -17,16 +20,19 @@ public class ProjectService {
     private final ProjectRepository projects;
     private final AccountService accounts;
     private final ProjectQueryService queries;
+    private final TaskQueryService taskQueries;
     private final Clock clock;
 
     public ProjectService(
             ProjectRepository projects,
             AccountService accounts,
             ProjectQueryService queries,
+            TaskQueryService taskQueries,
             Clock clock) {
         this.projects = projects;
         this.accounts = accounts;
         this.queries = queries;
+        this.taskQueries = taskQueries;
         this.clock = clock;
     }
 
@@ -70,6 +76,27 @@ public class ProjectService {
         return queries.taskContext(actorUserId, lockedProject(projectId));
     }
 
+    @Transactional
+    public void activate(long actorUserId, long projectId) {
+        var project = lockedProject(projectId);
+        project.authorizeOwner(actorUserId);
+        var activeMemberships = project.memberships().stream()
+                .filter(membership -> membership.isCurrent()
+                        && accounts.isEligibleIntern(membership.internUserId()))
+                .toList();
+        var activeMembershipIds = activeMemberships.stream()
+                .map(membership -> membership.id())
+                .collect(Collectors.toUnmodifiableSet());
+        Set<Long> activeInternUserIds = activeMemberships.stream()
+                .map(membership -> membership.internUserId())
+                .collect(Collectors.toUnmodifiableSet());
+        var allTaskAssigneesAreCurrent = taskQueries.countCurrentTasksAssignedOutside(
+                projectId, activeMembershipIds) == 0;
+
+        project.activate(actorUserId, activeInternUserIds, allTaskAssigneesAreCurrent, clock.instant());
+        projects.flush();
+    }
+
     private ProjectEntity lockedProject(long projectId) {
         return projects.findLockedById(projectId).orElseThrow(ProjectAccessDeniedException::new);
     }

src/main/resources/templates/projects/detail.html

@@ -16,6 +16,9 @@
         <div class="metric"><div class="metric-label">Leader</div><div class="metric-value" th:text="${project.leaderName}">Leader</div></div>
         <div class="metric"><div class="metric-label">Project window</div><div class="metric-value" th:text="${#temporals.format(project.startDate, 'dd/MM/yyyy') + ' – ' + #temporals.format(project.endDate, 'dd/MM/yyyy')}">15/08/2026 – 30/09/2026</div></div>
     </section>
+    <form class="inline-actions" th:if="${project.canManage and project.status == 'PLANNED'}" th:action="@{/projects/{id}/activate(id=${project.id})}" method="post">
+        <button class="button button-primary" type="submit">Activate</button>
+    </form>
     <nav class="tabs" aria-label="Project sections">
         <a class="tab" th:href="@{/projects/{id}(id=${project.id})}" aria-current="page">Overview</a>
         <a class="tab" th:href="@{/projects/{id}/members(id=${project.id})}">Members</a>

src/test/java/com/lab/labtimesheet/feature/project/controller/ProjectControllerTest.java

@@ -150,6 +150,54 @@ class ProjectControllerTest {
                 .andExpect(redirectedUrl("/projects/30"));
     }
 
+    @Test
+    @WithMockUser(username = "mentor@example.test")
+    void owningMentorCanActivateAPlannedProject() throws Exception {
+        when(pages.authenticatedUserId("mentor@example.test")).thenReturn(10L);
+
+        mvc.perform(post("/projects/30/activate").with(csrf()))
+                .andExpect(status().is3xxRedirection())
+                .andExpect(redirectedUrl("/projects/30"));
+
+        verify(projects).activate(10L, 30L);
+    }
+
+    @Test
+    @WithMockUser(username = "mentor@example.test")
+    void plannedProjectDetailShowsActivationOnlyToTheOwningMentor() throws Exception {
+        when(pages.authenticatedUserId("mentor@example.test")).thenReturn(10L);
+        when(pages.detail(10L, 30L)).thenReturn(new ProjectDetail(
+                30L,
+                "Intern Portal Refresh",
+                null,
+                "PLANNED",
+                LocalDate.of(2026, 8, 15),
+                LocalDate.of(2026, 9, 30),
+                "Mentor",
+                "Leader",
+                true));
+
+        mvc.perform(get("/projects/30"))
+                .andExpect(status().isOk())
+                .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.content()
+                        .string(containsString(">Activate<")));
+
+        when(pages.detail(10L, 30L)).thenReturn(new ProjectDetail(
+                30L,
+                "Intern Portal Refresh",
+                null,
+                "PLANNED",
+                LocalDate.of(2026, 8, 15),
+                LocalDate.of(2026, 9, 30),
+                "Mentor",
+                "Leader",
+                false));
+        mvc.perform(get("/projects/30"))
+                .andExpect(status().isOk())
+                .andExpect(org.springframework.test.web.servlet.result.MockMvcResultMatchers.content()
+                        .string(not(containsString(">Activate<"))));
+    }
+
     @Test
     @WithMockUser(username = "mentor@example.test")
     void invalidCreateSubmissionStaysOnSafeFormWithoutMutation() throws Exception {

src/test/java/com/lab/labtimesheet/feature/project/model/entity/ProjectEntityTest.java

@@ -11,6 +11,7 @@ import com.lab.labtimesheet.feature.project.model.ProjectInternEligibility;
 import com.lab.labtimesheet.feature.project.model.ProjectStatus;
 import java.time.Instant;
 import java.time.LocalDate;
+import java.util.Set;
 import org.junit.jupiter.api.Test;
 
 class ProjectEntityTest {
@@ -114,16 +115,20 @@ class ProjectEntityTest {
         var project = plannedProject();
 
         assertThrows(ProjectAccessDeniedException.class,
-                () -> project.activate(11L, true, CREATED_AT.plusSeconds(60)));
+                () -> project.activate(11L, Set.of(20L), true, CREATED_AT.plusSeconds(60)));
         assertThrows(ProjectRuleViolationException.class,
-                () -> project.activate(10L, false, CREATED_AT.plusSeconds(60)));
+                () -> project.activate(10L, Set.of(), true, CREATED_AT.plusSeconds(60)));
+        assertThrows(ProjectRuleViolationException.class,
+                () -> project.activate(10L, Set.of(21L), true, CREATED_AT.plusSeconds(60)));
+        assertThrows(ProjectRuleViolationException.class,
+                () -> project.activate(10L, Set.of(20L), false, CREATED_AT.plusSeconds(60)));
 
-        project.activate(10L, true, CREATED_AT.plusSeconds(60));
+        project.activate(10L, Set.of(20L), true, CREATED_AT.plusSeconds(60));
 
         assertEquals(ProjectStatus.ACTIVE, project.status());
         assertEquals(CREATED_AT.plusSeconds(60), project.activatedAt());
         assertThrows(ProjectRuleViolationException.class,
-                () -> project.activate(10L, true, CREATED_AT.plusSeconds(120)));
+                () -> project.activate(10L, Set.of(20L), true, CREATED_AT.plusSeconds(120)));
     }
 
     private static ProjectEntity plannedProject() {

src/test/java/com/lab/labtimesheet/feature/project/service/ProjectServiceIntegrationTest.java

@@ -215,6 +215,46 @@ class ProjectServiceIntegrationTest {
         assertTrue(members.stream().noneMatch(member -> member.currentLeader()));
     }
 
+    @Test
+    void ownerActivatesAPlannedProjectWhenCurrentMemberAndTaskAssigneeGuardsPass() {
+        long mentorId = user("mentor-activate@example.test", "MENTOR");
+        long leaderId = intern("leader-activate@example.test", "I014");
+        long projectId = createProject(mentorId, leaderId, "Ready to activate");
+
+        projectService.activate(mentorId, projectId);
+
+        assertEquals("ACTIVE", text("select status from projects where id = ?", projectId));
+        assertEquals(1, count("select count(*) from projects where id = ? and activated_at is not null", projectId));
+    }
+
+    @Test
+    void activationRejectsATaskAssignedToAFormerMemberWithoutPartialMutation() {
+        long mentorId = user("mentor-guard@example.test", "MENTOR");
+        long leaderId = intern("leader-guard@example.test", "I015");
+        long formerMemberId = intern("former-assignee@example.test", "I016");
+        long projectId = createProject(mentorId, leaderId, "Assignee guard");
+        projectService.addMember(mentorId, projectId, formerMemberId);
+        long leaderMembershipId = membershipId(projectId, leaderId);
+        long formerMembershipId = membershipId(projectId, formerMemberId);
+        jdbc.update("""
+                insert into tasks (
+                    project_id, assignee_membership_id, title,
+                    created_by_membership_id, assigned_by_membership_id)
+                values (?, ?, 'Former assignee', ?, ?)
+                """, projectId, formerMembershipId, leaderMembershipId, leaderMembershipId);
+        jdbc.update("""
+                update project_memberships
+                set left_at = ?, removed_by_mentor_user_id = ?, updated_at = ?
+                where id = ?
+                """, dbTime(NOW.plusSeconds(60)), mentorId, dbTime(NOW.plusSeconds(60)), formerMembershipId);
+        entityManager.clear();
+
+        assertThrows(ProjectRuleViolationException.class, () -> projectService.activate(mentorId, projectId));
+
+        assertEquals("PLANNED", text("select status from projects where id = ?", projectId));
+        assertEquals(1, count("select count(*) from tasks where project_id = ? and deleted_at is null", projectId));
+    }
+
     private long createProject(long mentorId, long leaderId, String name) {
         return projectService.create(
                 mentorId,

src/test/java/com/lab/labtimesheet/feature/project/service/ProjectTaskMutationContextTest.java

@@ -9,6 +9,7 @@ import com.lab.labtimesheet.feature.account.service.AccountService;
 import com.lab.labtimesheet.feature.project.model.dto.ProjectTaskContext;
 import com.lab.labtimesheet.feature.project.model.entity.ProjectEntity;
 import com.lab.labtimesheet.feature.project.repository.ProjectRepository;
+import com.lab.labtimesheet.feature.task.service.TaskQueryService;
 import java.time.Clock;
 import java.time.LocalDate;
 import java.util.List;
@@ -30,6 +31,9 @@ class ProjectTaskMutationContextTest {
     @Mock
     private ProjectQueryService queries;
 
+    @Mock
+    private TaskQueryService taskQueries;
+
     @Mock
     private ProjectEntity project;
 
@@ -45,7 +49,7 @@ class ProjectTaskMutationContextTest {
                 LocalDate.of(2026, 9, 30),
                 40L,
                 List.of());
-        var service = new ProjectService(projects, accounts, queries, Clock.systemUTC());
+        var service = new ProjectService(projects, accounts, queries, taskQueries, Clock.systemUTC());
         when(projects.findLockedById(projectId)).thenReturn(Optional.of(project));
         when(queries.taskContext(actorUserId, project)).thenReturn(expected);