fix: tui local shell consent UX (#1463)

- add local shell runner + denial notice + tests
- docs: describe ! local shell usage
- lint: drop unused Slack upload contentType
- cleanup: remove stray Swabble pins

Thanks @vignesh07.
Co-authored-by: Vignesh Natarajan <vigneshnatarajan92@gmail.com>

src/tui/tui-local-shell.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { createLocalShellRunner } from "./tui-local-shell.js";
+
+const createSelector = () => {
+  const selector = {
+    onSelect: undefined as ((item: { value: string; label: string }) => void) | undefined,
+    onCancel: undefined as (() => void) | undefined,
+    render: () => ["selector"],
+    invalidate: () => {},
+  };
+  return selector;
+};
+
+describe("createLocalShellRunner", () => {
+  it("logs denial on subsequent ! attempts without re-prompting", async () => {
+    const messages: string[] = [];
+    const chatLog = {
+      addSystem: (line: string) => {
+        messages.push(line);
+      },
+    };
+    const tui = { requestRender: vi.fn() };
+    const openOverlay = vi.fn();
+    const closeOverlay = vi.fn();
+    let lastSelector: ReturnType<typeof createSelector> | null = null;
+    const createSelectorSpy = vi.fn(() => {
+      lastSelector = createSelector();
+      return lastSelector;
+    });
+    const spawnCommand = vi.fn();
+
+    const { runLocalShellLine } = createLocalShellRunner({
+      chatLog,
+      tui,
+      openOverlay,
+      closeOverlay,
+      createSelector: createSelectorSpy,
+      spawnCommand,
+    });
+
+    const firstRun = runLocalShellLine("!ls");
+    expect(openOverlay).toHaveBeenCalledTimes(1);
+    lastSelector?.onSelect?.({ value: "no", label: "No" });
+    await firstRun;
+
+    await runLocalShellLine("!pwd");
+
+    expect(messages).toContain("local shell: not enabled");
+    expect(messages).toContain("local shell: not enabled for this session");
+    expect(createSelectorSpy).toHaveBeenCalledTimes(1);
+    expect(spawnCommand).not.toHaveBeenCalled();
+  });
+});