feat(mcp-sync): sync GitHub Copilot CLI's MCP servers too

Copilot CLI keeps its user MCP list in ~/.copilot/mcp-config.json (COPILOT_HOME moves it) but is
not a Codeman run mode, so it has no registry entry. Add the copilot-json dialect (mcpServers,
tools ["*"], type local/http/sse, checked against `copilot mcp add` 1.0.94) and declare Copilot as
a sync-only target in src/mcp-sync-targets.ts, listed after the registry CLIs. A server switched
off with `copilot mcp disable` is recorded in settings.json (disabledMcpServers), not on the
entry: sync reads that list so it is not copied, and reports the target unreadable if the file
is not valid JSON instead of guessing.

test/mcp-sync-targets.test.ts

@@ -0,0 +1,54 @@
+// @vitest-environment node
+import { chmodSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import { binaryOnPath, MCP_SYNC_ONLY_TOOLS, mcpSyncOnlyTargets } from '../src/mcp-sync-targets.js';
+import { mcpSyncTargets } from '../src/web/routes/mcp-sync-routes.js';
+
+describe('sync-only MCP targets (tools that are not Codeman run modes)', () => {
+  it('declares GitHub Copilot CLI with its config file, dialect and relocation var', () => {
+    const t = mcpSyncOnlyTargets(new Set(), () => true).find((x) => x.id === 'copilot')!;
+    expect(t).toMatchObject({
+      label: 'GitHub Copilot CLI',
+      path: '.copilot/mcp-config.json',
+      format: 'copilot-json',
+      relocation: { envVar: 'COPILOT_HOME', path: 'mcp-config.json' },
+      installed: true,
+    });
+  });
+
+  it('asks about the declared binary, and reports it not installed when it is missing', () => {
+    const asked: string[] = [];
+    const t = mcpSyncOnlyTargets(new Set(), (b) => (asked.push(b), false));
+    expect(asked).toEqual(MCP_SYNC_ONLY_TOOLS.map((x) => x.binary));
+    expect(t.every((x) => x.installed === false)).toBe(true);
+  });
+
+  it('yields to a registry CLI that already uses the id', () => {
+    expect(mcpSyncOnlyTargets(new Set(['copilot']), () => true)).toEqual([]);
+  });
+
+  it('comes after the registry CLIs in the targets the route syncs', () => {
+    const ids = mcpSyncTargets({}).map((t) => t.id);
+    expect(ids).toContain('copilot');
+    expect(ids.indexOf('copilot')).toBe(ids.length - 1);
+  });
+});
+
+describe('binaryOnPath', () => {
+  let dir: string;
+  beforeEach(() => {
+    dir = mkdtempSync(join(tmpdir(), 'bin-on-path-'));
+  });
+  afterEach(() => rmSync(dir, { recursive: true, force: true }));
+
+  it('finds an executable in PATH and ignores a non-executable file of the same name', () => {
+    writeFileSync(join(dir, 'fake-tool'), '#!/bin/sh\n');
+    chmodSync(join(dir, 'fake-tool'), 0o644);
+    expect(binaryOnPath('fake-tool', { PATH: dir })).toBe(false);
+    chmodSync(join(dir, 'fake-tool'), 0o755);
+    expect(binaryOnPath('fake-tool', { PATH: dir })).toBe(true);
+    expect(binaryOnPath('no-such-tool-xyz', { PATH: dir })).toBe(false);
+  });
+});