feat(providers): add Wave 3-A free-tier registries

open-sse/config/providers/registry/chatanywhere/index.ts

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+import type { RegistryEntry } from "../../shared.ts";
+import { buildOpenAiCompatibleRegistryEntry } from "../../shared.ts";
+
+// International endpoint; audited free access is limited to non-commercial use.
+export const chatanywhereProvider: RegistryEntry = buildOpenAiCompatibleRegistryEntry({
+  id: "chatanywhere",
+  alias: "chatanywhere",
+  baseUrl: "https://api.chatanywhere.org/v1/chat/completions",
+  modelsUrl: "https://api.chatanywhere.org/v1/models",
+  models: [],
+  passthroughModels: true,
+});

open-sse/config/providers/registry/ofoxai/index.ts

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+import type { RegistryEntry } from "../../shared.ts";
+import { buildOpenAiCompatibleRegistryEntry } from "../../shared.ts";
+
+export const ofoxaiProvider: RegistryEntry = buildOpenAiCompatibleRegistryEntry({
+  id: "ofoxai",
+  alias: "ofoxai",
+  baseUrl: "https://api.ofox.ai/v1/chat/completions",
+  modelsUrl: "https://api.ofox.ai/v1/models",
+  models: [],
+  passthroughModels: true,
+});

open-sse/config/providers/registry/zerolimitai/index.ts

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+import type { RegistryEntry } from "../../shared.ts";
+import { buildOpenAiCompatibleRegistryEntry } from "../../shared.ts";
+
+export const zerolimitaiProvider: RegistryEntry = buildOpenAiCompatibleRegistryEntry({
+  id: "zerolimitai",
+  alias: "zerolimitai",
+  baseUrl: "https://www.zerolimitai.com/api/v1/chat/completions",
+  modelsUrl: "https://www.zerolimitai.com/api/v1/models",
+  models: [],
+  passthroughModels: true,
+});

tests/unit/free-tier-providers-wave3-a.test.ts

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+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { chatanywhereProvider } from "../../open-sse/config/providers/registry/chatanywhere/index.ts";
+import { ofoxaiProvider } from "../../open-sse/config/providers/registry/ofoxai/index.ts";
+import { zerolimitaiProvider } from "../../open-sse/config/providers/registry/zerolimitai/index.ts";
+import type { RegistryEntry } from "../../open-sse/config/providers/shared.ts";
+
+const providers: Array<{
+  entry: RegistryEntry;
+  id: string;
+  chatUrl: string;
+  modelsUrl: string;
+}> = [
+  {
+    entry: ofoxaiProvider,
+    id: "ofoxai",
+    chatUrl: "https://api.ofox.ai/v1/chat/completions",
+    modelsUrl: "https://api.ofox.ai/v1/models",
+  },
+  {
+    entry: zerolimitaiProvider,
+    id: "zerolimitai",
+    chatUrl: "https://www.zerolimitai.com/api/v1/chat/completions",
+    modelsUrl: "https://www.zerolimitai.com/api/v1/models",
+  },
+  {
+    entry: chatanywhereProvider,
+    id: "chatanywhere",
+    chatUrl: "https://api.chatanywhere.org/v1/chat/completions",
+    modelsUrl: "https://api.chatanywhere.org/v1/models",
+  },
+];
+
+test("Wave 3-A providers expose OpenAI-compatible Bearer registries", () => {
+  for (const { entry, id, chatUrl, modelsUrl } of providers) {
+    assert.equal(entry.id, id);
+    assert.equal(entry.alias, id);
+    assert.equal(entry.format, "openai");
+    assert.equal(entry.executor, "default");
+    assert.equal(entry.authType, "apikey");
+    assert.equal(entry.authHeader, "bearer");
+    assert.equal(entry.baseUrl, chatUrl);
+    assert.equal(entry.modelsUrl, modelsUrl);
+    assert.equal(entry.passthroughModels, true);
+    assert.deepEqual(entry.models, []);
+  }
+});