feat(phase-5): WS5 — Developer Experience

Implements scaffold ZIP generator, Stoplight Elements API explorer, and CLI scaffold command:

Scaffold API:
- 25 template files for TypeScript/Python/Go/Java/Rust in src/templates/scaffold/
- ScaffoldService: in-memory ZIP via archiver, variable injection (AGENT_ID/NAME/CLIENT_ID/API_URL)
- ScaffoldController: tenant ownership check (403), language validation (400), ZIP stream response
- Route GET /sdk/scaffold/:agentId with rate limiter (10 req/min per tenant)
- Prometheus: scaffold_generated_total + scaffold_generation_duration_ms histogram

Portal:
- Replaced swagger-ui-react with @stoplight/elements API component
- Dynamic import (ssr: false) for browser-only DOM dependency
- Type declarations for @stoplight/elements and CSS module

CLI:
- sentryagent scaffold --agent-id <id> [--language typescript] [--out .]
- Raw fetch for binary ZIP stream → unzipper.Extract() → prints next steps
- Human-readable 400/403/404 error messages

Tests: 19 tests (unit + integration), ScaffoldService 80%+ branch coverage

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

src/types/index.ts

@@ -57,7 +57,11 @@ export type AuditAction =
   | 'org.member_added'
   | 'webhook.created'
   | 'webhook.updated'
-  | 'webhook.deleted';
+  | 'webhook.deleted'
+  | 'delegation.created'
+  | 'delegation.verified'
+  | 'delegation.revoked'
+  | 'scaffold.generated';
 
 /** Outcome of an audited action. */
 export type AuditOutcome = 'success' | 'failure';

src/types/scaffold.ts

@@ -0,0 +1,28 @@
+/**
+ * TypeScript types for the scaffold generator (WS5 Developer Experience).
+ */
+
+/** Supported target languages for scaffold generation. */
+export type ScaffoldLanguage = 'typescript' | 'python' | 'go' | 'java' | 'rust';
+
+/** Options for generating a scaffold project. */
+export interface ScaffoldOptions {
+  /** Agent UUID. */
+  agentId: string;
+  /** Human-readable agent name (used in filenames and README). */
+  agentName: string;
+  /** OAuth2 client ID pre-filled in .env.example. */
+  clientId: string;
+  /** Target programming language. */
+  language: ScaffoldLanguage;
+  /** API base URL injected into template files. */
+  apiUrl: string;
+}
+
+/** A single file within a scaffold template. */
+export interface ScaffoldTemplate {
+  /** Path within the ZIP archive (relative to the project root directory). */
+  archivePath: string;
+  /** File content with template variables replaced. */
+  content: string;
+}