docs: add Qoder to README install and supported-tools sections

Adds the project-and-global cp install snippet (matches Pi/Rovo Dev
shape since Qoder supports both .qoder/skills/ and ~/.qoder/skills/
per docs.qoder.com/extensions/skills) and adds qoder.com to the
Supported Tools list.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -180,6 +180,15 @@ cp -r dist/rovo-dev/.rovodev your-project/
 cp -r dist/rovo-dev/.rovodev/skills/* ~/.rovodev/skills/
 ```
 
+**Qoder:**
+```bash
+# Project-specific
+cp -r dist/qoder/.qoder your-project/
+
+# Or global (applies to all projects)
+cp -r dist/qoder/.qoder/skills/* ~/.qoder/skills/
+```
+
 ## Usage
 
 Once installed, use commands in your AI harness:
@@ -225,6 +234,7 @@ The detector catches 24 issues across AI slop (side-tab borders, purple gradient
 - [Kiro](https://kiro.dev)
 - [Trae](https://trae.ai)
 - [Rovo Dev](https://www.atlassian.com/software/rovo)
+- [Qoder](https://qoder.com)
 
 ## Contributing