fix(doctor): emit warning when tui.json is registered but opencode.json is not

Previously the tui-plugin-config check returned PASS when the server
plugin (oh-my-openagent in opencode.json) was missing but the TUI plugin
entry was present in tui.json. The plugin can't function with only half
of the registration — the server side handles tool dispatch, hook
execution, and SDK integration; the TUI side only ships the sidebar.

Now we emit a clear warning with the fix suggestion.

Addresses cubic-dev-ai's review on PR #4048 (severity 3/10).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/cli/doctor/checks/tui-plugin-config.test.ts

@@ -114,6 +114,22 @@ describe("tui-plugin-config check", () => {
     expect(result.issues).toHaveLength(0)
   })
 
+  it("warns when tui.json has our entry but server plugin is missing from opencode.json", async () => {
+    //#given tui.json has the TUI entry but opencode.json does not have the server entry
+    writeOpenCodeConfig(["some-other-plugin"])
+    writeTuiConfig([`${PLUGIN_NAME}/tui`])
+
+    //#when running the check
+    const result = await checkTuiPluginConfig()
+
+    //#then status is warn — TUI-only registration can't function without the server side
+    expect(result.status).toBe("warn")
+    expect(result.issues).toHaveLength(1)
+    expect(result.issues[0].severity).toBe("warning")
+    expect(result.issues[0].title).toContain("Server plugin entry missing")
+    expect(result.issues[0].fix).toBeDefined()
+  })
+
   it("skips when neither config registers the plugin", async () => {
     //#given an opencode.json and tui.json with no oh-my-openagent entries
     writeOpenCodeConfig(["some-other-plugin"])

src/cli/doctor/checks/tui-plugin-config.ts

@@ -149,6 +149,28 @@ export async function checkTuiPluginConfig(): Promise<CheckResult> {
     }
   }
 
+  if (!server.registered && tui.registered) {
+    issues.push({
+      title: "Server plugin entry missing from opencode.json",
+      description:
+        `The TUI plugin entry ("${PLUGIN_NAME}/${TUI_SUBPATH}") is registered in tui.json, `
+        + "but the server plugin (oh-my-openagent) is missing from opencode.json. "
+        + "The plugin cannot function correctly without both halves — the server side "
+        + "handles tool dispatch, hook execution, and SDK integration.",
+      fix: "Re-run the installer (`npx oh-my-openagent install`) to auto-write opencode.json, "
+        + `or add "${PLUGIN_NAME}" to the "plugin" array in ${server.configPath ?? "opencode.json"}.`,
+      affects: ["tool dispatch", "hook execution", "SDK integration"],
+      severity: "warning",
+    })
+    return {
+      name,
+      status: "warn",
+      message: "Server plugin entry missing from opencode.json",
+      details: details.length > 0 ? details : undefined,
+      issues,
+    }
+  }
+
   return {
     name,
     status: "pass",