Accept string form for worktree setup/teardown

Lifecycle config now takes either a multiline shell script string or an
array of commands, making it friendlier to edit in a textarea. Schema
parsing moved to Zod so coercion stays in one place.

packages/server/src/utils/worktree.test.ts

@@ -5,7 +5,9 @@ import {
   deriveWorktreeProjectHash,
   deletePaseoWorktree,
   getScriptConfigs,
+  getWorktreeSetupCommands,
   getWorktreeTerminalSpecs,
+  getWorktreeTeardownCommands,
   isServiceScript,
   isPaseoOwnedWorktreeCwd,
   listPaseoWorktrees,
@@ -442,6 +444,79 @@ describe.skipIf(process.platform === "win32")("createWorktree", () => {
     expect(portValue).toBeGreaterThan(0);
   });
 
+  it("runs string setup scripts from paseo.json as a single shell command", async () => {
+    const paseoConfig = {
+      worktree: {
+        setup: 'greeting="hello from string setup"\necho "$greeting" > setup.log',
+      },
+    };
+    writeFileSync(join(repoDir, "paseo.json"), JSON.stringify(paseoConfig));
+    execSync('git add paseo.json && git -c commit.gpgsign=false commit -m "add string setup"', {
+      cwd: repoDir,
+    });
+
+    const result = await createLegacyWorktreeForTest({
+      branchName: "main",
+      cwd: repoDir,
+      baseBranch: "main",
+      worktreeSlug: "string-setup-test",
+      paseoHome,
+    });
+
+    expect(getWorktreeSetupCommands(result.worktreePath)).toEqual([
+      'greeting="hello from string setup"\necho "$greeting" > setup.log',
+    ]);
+    expect(readFileSync(join(result.worktreePath, "setup.log"), "utf8").trim()).toBe(
+      "hello from string setup",
+    );
+  });
+
+  it("treats blank lifecycle strings as empty", () => {
+    writeFileSync(
+      join(repoDir, "paseo.json"),
+      JSON.stringify({
+        worktree: {
+          setup: " \n\t ",
+          teardown: " \n ",
+        },
+      }),
+    );
+
+    expect(getWorktreeSetupCommands(repoDir)).toEqual([]);
+    expect(getWorktreeTeardownCommands(repoDir)).toEqual([]);
+  });
+
+  it("filters non-string and blank entries from lifecycle arrays", () => {
+    writeFileSync(
+      join(repoDir, "paseo.json"),
+      JSON.stringify({
+        worktree: {
+          setup: [
+            'echo "first" > setup-array.log',
+            null,
+            "   ",
+            'echo "second" >> setup-array.log',
+          ],
+          teardown: [
+            'echo "first" > "$PASEO_SOURCE_CHECKOUT_PATH/teardown-array.log"',
+            null,
+            "",
+            'echo "second" >> "$PASEO_SOURCE_CHECKOUT_PATH/teardown-array.log"',
+          ],
+        },
+      }),
+    );
+
+    expect(getWorktreeSetupCommands(repoDir)).toEqual([
+      'echo "first" > setup-array.log',
+      'echo "second" >> setup-array.log',
+    ]);
+    expect(getWorktreeTeardownCommands(repoDir)).toEqual([
+      'echo "first" > "$PASEO_SOURCE_CHECKOUT_PATH/teardown-array.log"',
+      'echo "second" >> "$PASEO_SOURCE_CHECKOUT_PATH/teardown-array.log"',
+    ]);
+  });
+
   it("does not run setup commands when runSetup=false", async () => {
     const paseoConfig = {
       worktree: {
@@ -858,6 +933,34 @@ describe("paseo worktree manager", () => {
     expect(teardownLog).toContain(`port=${runtimeEnv.PASEO_WORKTREE_PORT}`);
   });
 
+  it("runs string teardown scripts from paseo.json as a single shell command", async () => {
+    const paseoConfig = {
+      worktree: {
+        teardown:
+          'cleanup_message="teardown string"\necho "$cleanup_message" > "$PASEO_SOURCE_CHECKOUT_PATH/teardown.log"',
+      },
+    };
+    writeFileSync(join(repoDir, "paseo.json"), JSON.stringify(paseoConfig));
+    execSync('git add paseo.json && git -c commit.gpgsign=false commit -m "add string teardown"', {
+      cwd: repoDir,
+    });
+
+    const created = await createLegacyWorktreeForTest({
+      branchName: "teardown-string-branch",
+      cwd: repoDir,
+      baseBranch: "main",
+      worktreeSlug: "teardown-string-test",
+      paseoHome,
+    });
+
+    await deletePaseoWorktree({ cwd: repoDir, worktreePath: created.worktreePath, paseoHome });
+
+    expect(getWorktreeTeardownCommands(repoDir)).toEqual([
+      'cleanup_message="teardown string"\necho "$cleanup_message" > "$PASEO_SOURCE_CHECKOUT_PATH/teardown.log"',
+    ]);
+    expect(readFileSync(join(repoDir, "teardown.log"), "utf8").trim()).toBe("teardown string");
+  });
+
   it("omits PASEO_WORKTREE_PORT from teardown env when runtime metadata is missing", async () => {
     const paseoConfig = {
       worktree: {