feat(phase-4): WS2 + WS3 — Developer Portal (Next.js 14) and CLI tool (sentryagent)

WS2: Developer Portal (portal/)
- Standalone Next.js 14 + Tailwind CSS app — independent deployment
- Home page: hero, feature grid, CTA to /get-started
- /pricing: free tier limits table (10 agents, 1k calls/day) + paid tier CTA
- /sdks: all 4 SDKs (Node.js, Python, Go, Java) with install + code examples
- /api-explorer: Swagger UI from NEXT_PUBLIC_API_URL/openapi.json, persistAuthorization
- /get-started: 4-step wizard (setup → register agent → credentials → SDK snippet)
- Shared Nav component with active-link highlighting
- Build: 8/8 static pages, zero TypeScript errors

WS3: CLI Tool (cli/ — npm package: sentryagent)
- configure, register-agent, list-agents, issue-token, rotate-credentials, tail-audit-log
- Auto OAuth2 token fetch + 30s-buffer cache via client_credentials flow
- chalk-formatted table output, confirmation prompts, bounded audit log dedup
- bash + zsh shell completion scripts
- README with installation, all commands, and completion setup
- Build: tsc clean, node dist/index.js --help verified

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

portal/components/SwaggerExplorer.tsx

@@ -0,0 +1,39 @@
+'use client';
+
+import React from 'react';
+import dynamic from 'next/dynamic';
+import type { SwaggerUIProps } from 'swagger-ui-react';
+import 'swagger-ui-react/swagger-ui.css';
+
+// Dynamically import SwaggerUI with no SSR — SwaggerUI requires browser globals
+const SwaggerUI = dynamic<SwaggerUIProps>(() => import('swagger-ui-react'), {
+  ssr: false,
+});
+
+interface SwaggerExplorerProps {
+  apiUrl: string;
+}
+
+const SUBMIT_METHODS: SwaggerUIProps['supportedSubmitMethods'] = [
+  'get',
+  'post',
+  'put',
+  'patch',
+  'delete',
+];
+
+export function SwaggerExplorer({
+  apiUrl,
+}: SwaggerExplorerProps): React.ReactElement {
+  const specUrl = `${apiUrl}/openapi.json`;
+
+  return (
+    <div className="swagger-wrapper min-h-screen">
+      <SwaggerUI
+        url={specUrl}
+        persistAuthorization={true}
+        supportedSubmitMethods={SUBMIT_METHODS}
+      />
+    </div>
+  );
+}