fix(cli): write version-aware plugin entry during installation

Previously, the installer always wrote 'oh-my-opencode' without a version,
causing users who installed beta versions (e.g., bunx oh-my-opencode@beta)
to unexpectedly load the stable version on next OpenCode startup.

Now the installer queries npm dist-tags and writes:
- @latest when current version matches the latest tag
- @beta when current version matches the beta tag
- @<version> when no tag matches (pins to specific version)

This ensures:
- bunx oh-my-opencode install → @latest (tracks stable)
- bunx oh-my-opencode@beta install → @beta (tracks beta tag)
- bunx oh-my-opencode@3.0.0-beta.2 install → @3.0.0-beta.2 (pinned)

src/cli/config-manager.test.ts

@@ -1,6 +1,156 @@
-import { describe, expect, test } from "bun:test"
+import { describe, expect, test, mock, beforeEach, afterEach } from "bun:test"
 
-import { ANTIGRAVITY_PROVIDER_CONFIG } from "./config-manager"
+import { ANTIGRAVITY_PROVIDER_CONFIG, getPluginNameWithVersion, fetchNpmDistTags } from "./config-manager"
+
+describe("getPluginNameWithVersion", () => {
+  const originalFetch = globalThis.fetch
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch
+  })
+
+  test("returns @latest when current version matches latest tag", async () => {
+    // #given npm dist-tags with latest=2.14.0
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "2.14.0", beta: "3.0.0-beta.3" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when current version is 2.14.0
+    const result = await getPluginNameWithVersion("2.14.0")
+
+    // #then should use @latest tag
+    expect(result).toBe("oh-my-opencode@latest")
+  })
+
+  test("returns @beta when current version matches beta tag", async () => {
+    // #given npm dist-tags with beta=3.0.0-beta.3
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "2.14.0", beta: "3.0.0-beta.3" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when current version is 3.0.0-beta.3
+    const result = await getPluginNameWithVersion("3.0.0-beta.3")
+
+    // #then should use @beta tag
+    expect(result).toBe("oh-my-opencode@beta")
+  })
+
+  test("returns @next when current version matches next tag", async () => {
+    // #given npm dist-tags with next=3.1.0-next.1
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "2.14.0", beta: "3.0.0-beta.3", next: "3.1.0-next.1" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when current version is 3.1.0-next.1
+    const result = await getPluginNameWithVersion("3.1.0-next.1")
+
+    // #then should use @next tag
+    expect(result).toBe("oh-my-opencode@next")
+  })
+
+  test("returns pinned version when no tag matches", async () => {
+    // #given npm dist-tags with beta=3.0.0-beta.3
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "2.14.0", beta: "3.0.0-beta.3" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when current version is old beta 3.0.0-beta.2
+    const result = await getPluginNameWithVersion("3.0.0-beta.2")
+
+    // #then should pin to specific version
+    expect(result).toBe("oh-my-opencode@3.0.0-beta.2")
+  })
+
+  test("returns pinned version when fetch fails", async () => {
+    // #given network failure
+    globalThis.fetch = mock(() => Promise.reject(new Error("Network error"))) as unknown as typeof fetch
+
+    // #when current version is 3.0.0-beta.3
+    const result = await getPluginNameWithVersion("3.0.0-beta.3")
+
+    // #then should fall back to pinned version
+    expect(result).toBe("oh-my-opencode@3.0.0-beta.3")
+  })
+
+  test("returns pinned version when npm returns non-ok response", async () => {
+    // #given npm returns 404
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: false,
+        status: 404,
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when current version is 2.14.0
+    const result = await getPluginNameWithVersion("2.14.0")
+
+    // #then should fall back to pinned version
+    expect(result).toBe("oh-my-opencode@2.14.0")
+  })
+})
+
+describe("fetchNpmDistTags", () => {
+  const originalFetch = globalThis.fetch
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch
+  })
+
+  test("returns dist-tags on success", async () => {
+    // #given npm returns dist-tags
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "2.14.0", beta: "3.0.0-beta.3" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when fetching dist-tags
+    const result = await fetchNpmDistTags("oh-my-opencode")
+
+    // #then should return the tags
+    expect(result).toEqual({ latest: "2.14.0", beta: "3.0.0-beta.3" })
+  })
+
+  test("returns null on network failure", async () => {
+    // #given network failure
+    globalThis.fetch = mock(() => Promise.reject(new Error("Network error"))) as unknown as typeof fetch
+
+    // #when fetching dist-tags
+    const result = await fetchNpmDistTags("oh-my-opencode")
+
+    // #then should return null
+    expect(result).toBeNull()
+  })
+
+  test("returns null on non-ok response", async () => {
+    // #given npm returns 404
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: false,
+        status: 404,
+      } as Response)
+    ) as unknown as typeof fetch
+
+    // #when fetching dist-tags
+    const result = await fetchNpmDistTags("oh-my-opencode")
+
+    // #then should return null
+    expect(result).toBeNull()
+  })
+})
 
 describe("config-manager ANTIGRAVITY_PROVIDER_CONFIG", () => {
   test("Gemini models include full spec (limit + modalities)", () => {