Add droid and cursor sync targets, extract shared path helpers

- Add sync --target droid (skills to ~/.factory/skills/)
- Add sync --target cursor (skills + MCP to .cursor/)
- Extract expandHome/resolveTargetHome to src/utils/resolve-home.ts
- Remove duplicated path helpers from convert.ts and install.ts
- Bump version to 0.6.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/sync-droid.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, test } from "bun:test"
+import { promises as fs } from "fs"
+import path from "path"
+import os from "os"
+import { syncToDroid } from "../src/sync/droid"
+import type { ClaudeHomeConfig } from "../src/parsers/claude-home"
+
+describe("syncToDroid", () => {
+  test("symlinks skills to factory skills dir", async () => {
+    const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), "sync-droid-"))
+    const fixtureSkillDir = path.join(import.meta.dir, "fixtures", "sample-plugin", "skills", "skill-one")
+
+    const config: ClaudeHomeConfig = {
+      skills: [
+        {
+          name: "skill-one",
+          sourceDir: fixtureSkillDir,
+          skillPath: path.join(fixtureSkillDir, "SKILL.md"),
+        },
+      ],
+      mcpServers: {
+        context7: { url: "https://mcp.context7.com/mcp" },
+      },
+    }
+
+    await syncToDroid(config, tempRoot)
+
+    const linkedSkillPath = path.join(tempRoot, "skills", "skill-one")
+    const linkedStat = await fs.lstat(linkedSkillPath)
+    expect(linkedStat.isSymbolicLink()).toBe(true)
+
+    // Droid does not write MCP config
+    const mcpExists = await fs.access(path.join(tempRoot, "mcp.json")).then(() => true).catch(() => false)
+    expect(mcpExists).toBe(false)
+  })
+
+  test("skips skills with invalid names", async () => {
+    const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), "sync-droid-invalid-"))
+    const fixtureSkillDir = path.join(import.meta.dir, "fixtures", "sample-plugin", "skills", "skill-one")
+
+    const config: ClaudeHomeConfig = {
+      skills: [
+        {
+          name: "../escape",
+          sourceDir: fixtureSkillDir,
+          skillPath: path.join(fixtureSkillDir, "SKILL.md"),
+        },
+      ],
+      mcpServers: {},
+    }
+
+    await syncToDroid(config, tempRoot)
+
+    const entries = await fs.readdir(path.join(tempRoot, "skills"))
+    expect(entries).toHaveLength(0)
+  })
+})