feat(transport-contract): add McpServerInfo + McpStatusResponse (0.22.0)

Additive types for GET /conversations/:id/mcp status endpoint, mirroring the
existing LSP status types. McpServerState, McpServerInfo, McpStatusResponse.
+2 type-test assertions. Version bump 0.21.0 → 0.22.0.

Handoff written: frontend-mcp-status-handoff.md (backend route + FE consumption).

3 files changed, 54 insertions, 1 deletions

diff --git a/packages/transport-contract/package.json b/packages/transport-contract/package.json
index 34c7fc4..842a28b 100644
--- a/packages/transport-contract/package.json
+++ b/packages/transport-contract/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@dispatch/transport-contract",
-	"version": "0.21.0",
+	"version": "0.22.0",
 	"type": "module",
 	"private": true,
 	"main": "dist/index.js",
diff --git a/packages/transport-contract/src/contract.types.test.ts b/packages/transport-contract/src/contract.types.test.ts
index e022812..6d0129c 100644
--- a/packages/transport-contract/src/contract.types.test.ts
+++ b/packages/transport-contract/src/contract.types.test.ts
@@ -12,6 +12,7 @@ import type {
 	LspServerInfo,
 	LspServerState,
 	LspStatusResponse,
+	McpStatusResponse,
 	SetCwdRequest,
 } from "./index.js";
 
@@ -129,4 +130,25 @@ describe("transport-contract types compile and are exported", () => {
 	it("LspStatusResponse: populated servers when cwd is set", () => {
 		expect(_lspWithServers.servers).toHaveLength(2);
 	});
+
+	// ─── MCP status ─────────────────────────────────────────────────────────────
+
+	it("McpStatusResponse: empty servers when cwd is null", () => {
+		const _noCwd: McpStatusResponse = { conversationId: "c1", cwd: null, servers: [] };
+		expect(_noCwd.servers).toEqual([]);
+	});
+
+	it("McpStatusResponse: populated servers when cwd is set", () => {
+		const _withServers: McpStatusResponse = {
+			conversationId: "c2",
+			cwd: "/home/user/project",
+			servers: [
+				{ id: "freecad", state: "connected", toolCount: 12, configSource: ".dispatch/mcp.json" },
+				{ id: "chrome", state: "error", error: "spawn failed", toolCount: 0 },
+			],
+		};
+		expect(_withServers.servers).toHaveLength(2);
+		expect(_withServers.servers[0]?.toolCount).toBe(12);
+		expect(_withServers.servers[1]?.error).toBe("spawn failed");
+	});
 });
diff --git a/packages/transport-contract/src/index.ts b/packages/transport-contract/src/index.ts
index c251ae4..4e3e7dc 100644
--- a/packages/transport-contract/src/index.ts
+++ b/packages/transport-contract/src/index.ts
@@ -455,6 +455,37 @@ export interface LspStatusResponse {
 	readonly servers: readonly LspServerInfo[];
 }
 
+// ─── MCP status ──────────────────────────────────────────────────────
+
+export type McpServerState = "connecting" | "connected" | "error" | "disconnected";
+
+/** One MCP server's status as reported to the frontend. */
+export interface McpServerInfo {
+	/** Stable server id (the config key from `.dispatch/mcp.json`), e.g. "freecad". */
+	readonly id: string;
+	/** Current connection state. */
+	readonly state: McpServerState;
+	/** Present only when `state === "error"`: a short human-readable reason. */
+	readonly error?: string;
+	/** Number of tools discovered from this server. */
+	readonly toolCount: number;
+	/** Which config source this server was resolved from. */
+	readonly configSource?: string;
+}
+
+/** Response of `GET /conversations/:id/mcp`. */
+export interface McpStatusResponse {
+	readonly conversationId: string;
+	/**
+	 * The resolved working directory the MCP servers are configured for, or
+	 * `null` when no cwd has been set for the conversation (then `servers` is
+	 * empty). Mirrors the LSP status endpoint behavior.
+	 */
+	readonly cwd: string | null;
+	/** The MCP servers configured for `cwd` and their live state. */
+	readonly servers: readonly McpServerInfo[];
+}
+
 /**
  * Request body for `POST /chat/warm` — manually trigger a prompt-cache WARMING
  * request for a conversation (e.g. a frontend "warm now" button, or fast tests