refactor(ai): rebranded openrouter identifiers and user agent to omp

- Updated user agent and openrouter titles in packages/ai from Oh-My-Pi to omp.
- Integrated getOpenRouterHeaders into image generation tool requests in packages/coding-agent.
- Updated provider documentation and test assertions to reflect the rebrand.

docs/provider-quirks.md

@@ -1303,7 +1303,7 @@ OpenRouter is a unified multi-provider routing gateway serving hundreds of third
 - **Provider Order & Exclusion Preferences**: `applyOpenAIGatewayRouting` in `packages/ai/src/providers/openai-shared.ts` injects catalog `openRouterRouting` preferences (`OpenRouterRouting` interface with `only?: string[]` and `order?: string[]`) into the top-level `provider` request parameter when `compat.isOpenRouterHost` is true.
 - **Anthropic `cache_control` Breakpoints**: `isOpenRouterAnthropicModel` (`packages/ai/src/providers/openai-shared.ts`) identifies models matching `provider === "openrouter"` and ID starting with `anthropic/`. On the Chat Completions wire, `applyOpenAIChatCompletionsPromptCachePolicy` (`openai-completions.ts`) attaches `cache_control: { type: "ephemeral" }` to the last non-empty text part of the latest message. On the Responses wire, `applyOpenAIResponsesPromptCachePolicy` (`openai-responses.ts`) sets `params.cache_control = cacheRetention === "long" ? { type: "ephemeral", ttl: "1h" } : { type: "ephemeral" }`.
 - **Catalog Default Max-Tokens Omission**: `resolveOpenAIOutputTokenParam` in `packages/ai/src/providers/openai-shared.ts` omits default output token limits (`max_tokens`, `max_completion_tokens`, `max_output_tokens`) when `isOpenRouterHost` is true and `maxTokensExplicit` is false. This prevents OpenRouter from filtering out upstreams whose advertised output ceiling is below catalog maximums when executing `provider.order` / `only` fallbacks; explicitly specified caller `maxTokens` are retained.
-- **Custom Request Headers**: `getOpenRouterHeaders` in `packages/ai/src/utils/openrouter-headers.ts` attaches `User-Agent: Oh-My-Pi/<ver>`, `HTTP-Referer: https://omp.sh/`, `X-OpenRouter-Title: Oh-My-Pi`, `X-OpenRouter-Categories: cli-agent`, `X-OpenRouter-Cache: true`, and `X-OpenRouter-Cache-TTL: 3600` to all requests for edge response caching.
+- **Custom Request Headers**: `getOpenRouterHeaders` in `packages/ai/src/utils/openrouter-headers.ts` attaches `User-Agent: omp/<ver>`, `HTTP-Referer: https://omp.sh/`, `X-OpenRouter-Title: omp`, `X-OpenRouter-Categories: cli-agent`, `X-OpenRouter-Cache: true`, and `X-OpenRouter-Cache-TTL: 3600` to all requests for edge response caching.
 
 ### Auth & usage
 - **Auth Key Validation via `/api/v1/auth/key`**: `loginOpenRouter` in `packages/ai/src/registry/openrouter.ts` configures API key validation using `validateApiKeyAgainstModelsEndpoint` targeted at `https://openrouter.ai/api/v1/auth/key`. Public `/api/v1/models` returns HTTP 200 for unauthenticated requests, so `/api/v1/auth/key` is used as the canonical identity check (returning 200 for valid keys, 401 otherwise). Key resolution checks `OPENROUTER_API_KEY` via `getEnvApiKey` in `packages/ai/src/stream.ts`.

packages/ai/src/utils/openrouter-headers.ts

@@ -2,9 +2,9 @@ import packageJson from "../../package.json" with { type: "json" };
 
 export function getOpenRouterHeaders(): Record<string, string> {
 	return {
-		"User-Agent": `Oh-My-Pi/${packageJson.version}`,
+		"User-Agent": `omp/${packageJson.version}`,
 		"HTTP-Referer": "https://omp.sh/",
-		"X-OpenRouter-Title": "Oh-My-Pi",
+		"X-OpenRouter-Title": "omp",
 		"X-OpenRouter-Categories": "cli-agent",
 		"X-OpenRouter-Cache": "true",
 		"X-OpenRouter-Cache-TTL": "3600",

packages/coding-agent/src/tools/image-gen.ts

@@ -1,7 +1,7 @@
 import * as os from "node:os";
 import * as path from "node:path";
 import { type } from "@oh-my-pi/omptype";
-import { type ApiKey, type FetchImpl, getEnvApiKey, type Model, withAuth } from "@oh-my-pi/pi-ai";
+import { type ApiKey, type FetchImpl, getEnvApiKey, getOpenRouterHeaders, type Model, withAuth } from "@oh-my-pi/pi-ai";
 import { ProviderHttpError } from "@oh-my-pi/pi-ai/error";
 import {
 	CODEX_BASE_URL,
@@ -1479,9 +1479,7 @@ export const imageGenTool: CustomTool<typeof imageGenSchema, ImageGenToolDetails
 									headers: {
 										"Content-Type": "application/json",
 										Authorization: `Bearer ${key}`,
-										"HTTP-Referer": "https://omp.sh/",
-										"X-OpenRouter-Title": "Oh-My-Pi",
-										"X-OpenRouter-Categories": "cli-agent",
+										...getOpenRouterHeaders(),
 									},
 									body: JSON.stringify(requestBody),
 									signal: requestSignal,

packages/mnemopi/test/optional-embeddings.test.ts

@@ -133,9 +133,9 @@ describe("optional embeddings", () => {
 			fetch: async request => {
 				requests += 1;
 				expect(request.headers.get("content-type")).toBe("application/json");
-				expect(request.headers.get("user-agent")).toBe(`Oh-My-Pi/${packageJson.version}`);
+				expect(request.headers.get("user-agent")).toBe(`omp/${packageJson.version}`);
 				expect(request.headers.get("http-referer")).toBe("https://omp.sh/");
-				expect(request.headers.get("x-openrouter-title")).toBe("Oh-My-Pi");
+				expect(request.headers.get("x-openrouter-title")).toBe("omp");
 				expect(request.headers.get("x-openrouter-categories")).toBe("cli-agent");
 				expect(request.headers.get("x-title")).toBeNull();
 				expect(request.headers.get("authorization")).toBeNull();

scripts/rewrite-system-prompt.ts

@@ -417,7 +417,7 @@ export function makeOpenRouterRewriter(opts: OpenRouterOptions): RewriteChunk {
 						Authorization: `Bearer ${opts.apiKey}`,
 						"Content-Type": "application/json",
 						"HTTP-Referer": "https://omp.sh/",
-						"X-Title": "Oh-My-Pi",
+						"X-Title": "omp",
 					},
 					body,
 				});