feat(sync): add Claude home sync parity across providers

tests/sync-codex.test.ts

@@ -0,0 +1,64 @@
+import { describe, expect, test } from "bun:test"
+import { promises as fs } from "fs"
+import os from "os"
+import path from "path"
+import type { ClaudeHomeConfig } from "../src/parsers/claude-home"
+import { syncToCodex } from "../src/sync/codex"
+
+describe("syncToCodex", () => {
+  test("writes stdio and remote MCP servers into a managed block without clobbering user config", async () => {
+    const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), "sync-codex-"))
+    const fixtureSkillDir = path.join(import.meta.dir, "fixtures", "sample-plugin", "skills", "skill-one")
+    const configPath = path.join(tempRoot, "config.toml")
+
+    await fs.writeFile(
+      configPath,
+      [
+        "[custom]",
+        "enabled = true",
+        "",
+        "# BEGIN compound-plugin Claude Code MCP",
+        "[mcp_servers.old]",
+        "command = \"old\"",
+        "# END compound-plugin Claude Code MCP",
+        "",
+        "[post]",
+        "value = 2",
+        "",
+      ].join("\n"),
+    )
+
+    const config: ClaudeHomeConfig = {
+      skills: [
+        {
+          name: "skill-one",
+          sourceDir: fixtureSkillDir,
+          skillPath: path.join(fixtureSkillDir, "SKILL.md"),
+        },
+      ],
+      mcpServers: {
+        local: { command: "echo", args: ["hello"], env: { KEY: "VALUE" } },
+        remote: { url: "https://example.com/mcp", headers: { Authorization: "Bearer token" } },
+      },
+    }
+
+    await syncToCodex(config, tempRoot)
+
+    const skillPath = path.join(tempRoot, "skills", "skill-one")
+    expect((await fs.lstat(skillPath)).isSymbolicLink()).toBe(true)
+
+    const content = await fs.readFile(configPath, "utf8")
+    expect(content).toContain("[custom]")
+    expect(content).toContain("[post]")
+    expect(content).not.toContain("[mcp_servers.old]")
+    expect(content).toContain("[mcp_servers.local]")
+    expect(content).toContain("command = \"echo\"")
+    expect(content).toContain("[mcp_servers.remote]")
+    expect(content).toContain("url = \"https://example.com/mcp\"")
+    expect(content).toContain("http_headers")
+    expect(content.match(/# BEGIN compound-plugin Claude Code MCP/g)?.length).toBe(1)
+
+    const perms = (await fs.stat(configPath)).mode & 0o777
+    expect(perms).toBe(0o600)
+  })
+})