feat: ship docker as a first-party in-process plugin

Moves docker backend and frontend into plugins/docker/, alongside
ssh-terminal. Adds a host editor tab seam, a dashboard card registry,
and a build step to compile plugin backends into dist.

src/backend/tests/plugins/bundled-plugin.test.ts

@@ -82,3 +82,57 @@ describe("bundled ssh-terminal plugin", () => {
     expect(source).toMatch(/export async function deactivate/);
   });
 });
+
+describe("bundled docker plugin", () => {
+  it("ships a directory with a manifest and both entry points", () => {
+    const dir = path.join(getBundledPluginsDir(), "docker");
+
+    expect(fs.existsSync(path.join(dir, "manifest.json"))).toBe(true);
+    expect(fs.existsSync(path.join(dir, "backend", "index.mjs"))).toBe(true);
+    expect(fs.existsSync(path.join(dir, "frontend", "index.mjs"))).toBe(true);
+  });
+
+  it("has a manifest that passes the real validator", () => {
+    const { manifest, errors } = parseManifest(readBundledManifest("docker"));
+
+    expect(errors).toEqual([]);
+    expect(manifest?.id).toBe("docker");
+    expect(manifest?.category).toBe("Infrastructure");
+  });
+
+  it("declares the transport-owner capability and qualifies for the tier", () => {
+    const { manifest } = parseManifest(readBundledManifest("docker"));
+
+    expect(manifest?.permissions).toContain(TRANSPORT_OWNER_CAPABILITY);
+    expect(isFirstParty("docker")).toBe(true);
+    expect(runsInProcess("docker", manifest!.permissions)).toBe(true);
+  });
+
+  it("contributes the docker tab the shell registers", () => {
+    const { manifest } = parseManifest(readBundledManifest("docker"));
+    const tab = manifest?.contributes?.tabs?.[0];
+
+    // The shell keys tab content off this id, so it has to stay "docker".
+    expect(tab?.id).toBe("docker");
+    expect(tab?.openFrom).toContain("host-context-menu");
+  });
+
+  it("declares the enableDocker host capability", () => {
+    const { manifest } = parseManifest(readBundledManifest("docker"));
+
+    expect(manifest?.contributes?.hostCapability?.key).toBe("enableDocker");
+  });
+
+  it("exports activate and deactivate from its backend entry", () => {
+    const entry = path.join(
+      getBundledPluginsDir(),
+      "docker",
+      "backend",
+      "index.mjs",
+    );
+    const source = fs.readFileSync(entry, "utf8");
+
+    expect(source).toMatch(/export async function activate/);
+    expect(source).toMatch(/export async function deactivate/);
+  });
+});

src/backend/tests/plugins/first-party.test.ts

@@ -39,12 +39,16 @@ function manifest(overrides: Record<string, unknown> = {}) {
 }
 
 describe("first-party allowlist", () => {
-  it("contains only ssh-terminal", () => {
-    expect([...FIRST_PARTY_PLUGIN_IDS]).toEqual(["ssh-terminal"]);
+  it("contains only ssh-terminal and docker", () => {
+    expect([...FIRST_PARTY_PLUGIN_IDS].sort()).toEqual([
+      "docker",
+      "ssh-terminal",
+    ]);
   });
 
-  it("recognises ssh-terminal and nothing else", () => {
+  it("recognises ssh-terminal and docker and nothing else", () => {
     expect(isFirstParty("ssh-terminal")).toBe(true);
+    expect(isFirstParty("docker")).toBe(true);
     expect(isFirstParty("ssh-terminal-pro")).toBe(false);
     expect(isFirstParty("community-plugin")).toBe(false);
     expect(isFirstParty("")).toBe(false);
@@ -56,10 +60,12 @@ describe("runsInProcess", () => {
     expect(runsInProcess("ssh-terminal", [TRANSPORT_OWNER_CAPABILITY])).toBe(
       true,
     );
+    expect(runsInProcess("docker", [TRANSPORT_OWNER_CAPABILITY])).toBe(true);
 
     // On the list but not asking for it: stays in a worker, so the manifest
     // remains an honest description of what the plugin does.
     expect(runsInProcess("ssh-terminal", ["hosts.read"])).toBe(false);
+    expect(runsInProcess("docker", ["hosts.read"])).toBe(false);
 
     // Asking for it but not on the list.
     expect(
@@ -103,6 +109,18 @@ describe("manifest gate on the reserved capability", () => {
     expect(parsed?.id).toBe("ssh-terminal");
   });
 
+  it("allows it for docker", () => {
+    const { manifest: parsed, errors } = parseManifest(
+      manifest({
+        id: "docker",
+        permissions: [TRANSPORT_OWNER_CAPABILITY],
+      }),
+    );
+
+    expect(errors).toEqual([]);
+    expect(parsed?.id).toBe("docker");
+  });
+
   it("still accepts an ordinary manifest that never mentions it", () => {
     const { manifest: parsed, errors } = parseManifest(
       manifest({ permissions: ["hosts.read"] }),