fix: resolve test-matrix CI error with correct pixi task

Fix pixi run command in test-matrix workflow that was causing all CI failures.
Changed from `pixi run -e ci dev` to `pixi run -e ci ci-dev` to align with
pyproject.toml task definitions for CI environment.

Error resolved: Install dev dependencies using pixi (exit code 1)
Job: test-matrix (all Python versions)

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

Author: MementoRC

.github/workflows/test-matrix.yml

@@ -79,7 +79,7 @@ jobs:
       - name: Install dev dependencies using pixi
         shell: bash
         run: |
-          pixi run -e ci dev
+          pixi run -e ci ci-dev
 
       - name: Verify pixi environment
         shell: bash