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/package.json

@@ -4,10 +4,11 @@
   "private": true,
   "type": "module",
   "bin": {
-    "reviq": "./dist/index.js"
+    "reviq": "./dist/index.js",
+    "__reviq_bash_complete": "./dist/bash-complete.js"
   },
   "scripts": {
-    "build": "bun build src/bin/reviq.ts --outdir dist --target bun",
+    "build": "bun build src/bin/reviq.ts --outfile dist/index.js --target bun && bun build src/bin/bash-complete.ts --outfile dist/bash-complete.js --target bun",
     "cli": "bun run src/bin/reviq.ts",
     "typecheck": "tsc --noEmit",
     "lint": "eslint . --cache",
@@ -15,6 +16,7 @@
   },
   "dependencies": {
     "@stricli/core": "^1.2.5",
+    "@stricli/auto-complete": "^1.0.0",
     "@reviq/db": "workspace:*",
     "@noble/hashes": "^2.0.1"
   },