Fix CI: persist git identity in agent-tools test, not just override it

git -c user.email=... only overrides that single git invocation; it never
writes to the repo config. The commit.gpgsign=false call was the only part
that actually persisted, so the git_commit test relied on the runner having
a global git identity to fall back on. Our machines all have one set, but
GitHub Actions runners do not, so  failed there with "Author
identity unknown" on every run since 105db65.

Author: voidstackloop

app/src/agent-tools.test.ts

@@ -499,7 +499,13 @@ describe("agent-tools", () => {
     describe("git tools", () => {
         beforeEach(() => {
             execSync("git init -q", { cwd: workspace });
-            execSync('git -c user.email=test@test.com -c user.name=Test config commit.gpgsign false', { cwd: workspace });
+            // Actually persisted into the repo's config (unlike `git -c key=value`,
+            // which only overrides that one invocation) — CI runners have no global
+            // git identity to fall back on, so without this `git commit` fails with
+            // "Author identity unknown".
+            execSync('git config user.email test@test.com', { cwd: workspace });
+            execSync('git config user.name Test', { cwd: workspace });
+            execSync('git config commit.gpgsign false', { cwd: workspace });
             fs.writeFileSync(path.join(workspace, "a.txt"), "hello");
         });