Implement shell completions for CLI (Workstream N-Completions)

Add `reviq completions bash/zsh` command with dynamic shell completions:

- Create bash-complete.ts entry point using stricli's proposeCompletions API
- Add completions command with bash and zsh support (fish planned)
- Extract app export to separate app.ts for shared imports
- Add @stricli/auto-complete dependency and __reviq_bash_complete bin entry

Also fix lint/type errors in api-server tests and helpers.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/cli/src/app.ts

@@ -0,0 +1,9 @@
+import { buildApplication } from "@stricli/core";
+import { rootRouteMap } from "./routes/_command.js";
+
+export const app = buildApplication(rootRouteMap, {
+  name: "reviq",
+  versionInfo: {
+    currentVersion: "0.0.0",
+  },
+});