feat(ci): v0.9.0 — Distribution & Expansion milestone complete

---ci---
project: ci
phase: 6
milestone: v0.9
status: complete
artifacts:
  tags: [v0.9.0]
decisions:
  - id: D-047
    decision: v0.9 theme = Distribution & Expansion
    rationale: npm publish + OpenAI/Anthropic backends + agent flesh + parallel execution
    confidence: 0.92
  - id: D-049
    decision: Feature milestone — patch tags v0.8.1-v0.8.6 then v0.9.0
    rationale: OpenAI backend, agent flesh, npm publish all feat
    confidence: 0.95
  - id: D-059
    decision: Rename OllamaBaseBackend to LLMBaseBackend + thin OllamaBaseBackend subclass
    rationale: 15 of 17 methods backend-agnostic
    confidence: 0.92
  - id: D-060
    decision: OpenAI/Anthropic backends use native fetch() not SDK packages
    rationale: No dependency bloat; fetch native in Node 18+
    confidence: 0.85
  - id: D-066
    decision: Concurrency limiter internal (no p-limit dependency)
    rationale: 15 lines; avoids dependency for trivial feature
    confidence: 0.90
  - id: D-067
    decision: Promise.allSettled for review agents at orchestrator lines 373-400
    rationale: Current sequential loop replaced with parallel execution
    confidence: 0.88
requirements:
  covered: [PUBLISH-01, PUBLISH-02, PUBLISH-03, PUBLISH-04, OPENAI-01, OPENAI-02, OPENAI-03, OPENAI-04, OPENAI-05, FLESH-01, FLESH-02, FLESH-03, FLESH-04, FLESH-05, ANTHROPIC-01, ANTHROPIC-02, FLESH-06, FLESH-07, NPM-01, NPM-02, PARALLEL-01, PARALLEL-02, PARALLEL-03, INTEG-01, INTEG-02, INTEG-03, INTEG-04, INTEG-05]
---/ci---

6 phases, 28 tasks, 4077 net lines added, 57 test suites, 527 tests, zero stub agents

src/backends/types.ts

@@ -115,20 +115,34 @@ export interface OllamaCloudConfig extends LLMBackendConfig {
   timeout_ms?: number;
 }
 
+export interface OpenAIConfig extends LLMBackendConfig {
+  api_key_env: string;
+  model: string;
+  organization?: string;
+}
+
+export interface AnthropicConfig extends LLMBackendConfig {
+  api_key_env: string;
+  model: string;
+  api_version?: string;
+}
+
 export interface OpencodeBackendConfig {
   enabled: boolean;
   executable?: string;
 }
 
 export interface BackendConfigSection {
-  provider: "auto" | "opencode" | "ollama-local" | "ollama-cloud";
-  fallback?: "opencode" | "ollama-local" | "ollama-cloud";
+  provider: "auto" | "opencode" | "openai" | "ollama-local" | "ollama-cloud" | "anthropic";
+  fallback?: "opencode" | "openai" | "ollama-local" | "ollama-cloud" | "anthropic";
   agent_backends: {
     opencode?: OpencodeBackendConfig;
   };
   llm_backends: {
+    "openai"?: OpenAIConfig;
     "ollama-local"?: OllamaLocalConfig;
     "ollama-cloud"?: OllamaCloudConfig;
+    "anthropic"?: AnthropicConfig;
   };
 }
 
@@ -138,6 +152,13 @@ export const DEFAULT_BACKEND_CONFIG: BackendConfigSection = {
     opencode: { enabled: true },
   },
   llm_backends: {
+    "openai": {
+      base_url: "https://api.openai.com/v1",
+      api_key_env: "OPENAI_API_KEY",
+      model: "gpt-4o",
+      model_profile: "quality",
+      timeout_ms: 60000,
+    },
     "ollama-local": {
       base_url: "http://localhost:11434",
       model_profile: "balanced",
@@ -148,6 +169,14 @@ export const DEFAULT_BACKEND_CONFIG: BackendConfigSection = {
       model_profile: "quality",
       timeout_ms: 60000,
     },
+    "anthropic": {
+      base_url: "https://api.anthropic.com",
+      api_key_env: "ANTHROPIC_API_KEY",
+      model: "claude-sonnet-4-20250514",
+      api_version: "2023-06-01",
+      model_profile: "quality",
+      timeout_ms: 60000,
+    },
   },
 };
 
@@ -161,8 +190,10 @@ export class BackendUnavailableError extends Error {
       `Intelligence backend "${backendName}" is not available${agentMsg}. ` +
       `Configure one of:\n` +
       `  1. Install opencode: npm i -g opencode\n` +
-      `  2. Run Ollama locally: ollama serve\n` +
-      `  3. Set OLLAMA_CLOUD_API_KEY for remote inference`
+      `  2. Set OPENAI_API_KEY for OpenAI API access\n` +
+      `  3. Set ANTHROPIC_API_KEY for Anthropic API access\n` +
+      `  4. Run Ollama locally: ollama serve\n` +
+      `  5. Set OLLAMA_CLOUD_API_KEY for remote inference`
     );
     this.name = "BackendUnavailableError";
     this.backendName = backendName;
@@ -184,4 +215,6 @@ export function emptyBackendResult(error?: string): BackendResult {
     usage: emptyTokenUsage(),
     error,
   };
-}
+}
+
+export { ChatMessage, ChatCompletionResponse } from "./llm-base.js";