feat: add Qwen install target

docs/QWEN-GUIDE.md

@@ -0,0 +1,54 @@
+# Qwen CLI Adapter Guide
+
+ECC can install its managed command, agent, skill, rule, and MCP surfaces into the Qwen CLI home directory.
+
+## Install
+
+From the ECC repository root:
+
+```bash
+./install.sh --target qwen --profile minimal
+```
+
+Preview a larger install before copying files:
+
+```bash
+./install.sh --target qwen --profile full --dry-run
+```
+
+The Qwen adapter writes into `~/.qwen/` and records managed file ownership in `~/.qwen/ecc-install-state.json`.
+
+## Installed Layout
+
+The managed install can populate:
+
+```text
+~/.qwen/
+  QWEN.md
+  agents/
+  commands/
+  mcp-configs/
+  rules/
+  skills/
+  ecc-install-state.json
+```
+
+The installer preserves the source layout for rules, so language rule sets stay under paths such as `~/.qwen/rules/common/` and `~/.qwen/rules/typescript/`.
+
+## Updating
+
+Rerun the same install command after pulling ECC updates. The installer uses the install-state file to update ECC-managed files without claiming unrelated user files in `~/.qwen/`.
+
+## Uninstalling
+
+Use the managed uninstall path rather than deleting the whole Qwen directory:
+
+```bash
+node scripts/uninstall.js --target qwen
+```
+
+That removes files recorded in `~/.qwen/ecc-install-state.json` and leaves unrelated Qwen configuration alone.
+
+## Scope
+
+This target is intentionally narrower than stale PR #1352. It ports the maintainable Qwen install-target intent onto the current selective installer and avoids unverified hook-runtime claims until Qwen's hook/event contract is confirmed.