Fix execution workspace reuse and slugify worktrees

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/workspace-runtime.test.ts

@@ -247,6 +247,43 @@ describe("realizeExecutionWorkspace", () => {
     expect(second.branchName).toBe(first.branchName);
   });
 
+  it("slugifies unsafe issue titles for branch names and worktree folders", async () => {
+    const repoRoot = await createTempRepo();
+
+    const realized = await realizeExecutionWorkspace({
+      base: {
+        baseCwd: repoRoot,
+        source: "project_primary",
+        projectId: "project-1",
+        workspaceId: "workspace-1",
+        repoUrl: null,
+        repoRef: "HEAD",
+      },
+      config: {
+        workspaceStrategy: {
+          type: "git_worktree",
+          branchTemplate: "{{issue.identifier}}-{{slug}}",
+        },
+      },
+      issue: {
+        id: "issue-unsafe",
+        identifier: "PAP-991",
+        title: "there should be a setting for the allowance of thumbs up / thumbs down data; `rm -rf`",
+      },
+      agent: {
+        id: "agent-1",
+        name: "Codex Coder",
+        companyId: "company-1",
+      },
+    });
+
+    expect(realized.branchName).toBe(
+      "PAP-991-there-should-be-a-setting-for-the-allowance-of-thumbs-up-thumbs-down-data-rm-rf",
+    );
+    expect(realized.branchName?.includes("/")).toBe(false);
+    expect(path.basename(realized.cwd)).toBe(realized.branchName);
+  });
+
   it("runs a configured provision command inside the derived worktree", async () => {
     const repoRoot = await createTempRepo();
     await fs.mkdir(path.join(repoRoot, "scripts"), { recursive: true });