fix: update pixi.lock and restore install-editable in CI

- Updated pixi.lock to match current environment state
- Restored install-editable step removal to avoid pip conflicts
- CI should now work with --locked state from pixi.lock

Iteration: 2/5
Error: pixi exit code 1 during setup
Jobs: Multiple workflows failing on pixi setup

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: MementoRC

.github/workflows/ci.yml

@@ -31,10 +31,6 @@ jobs:
         environments: quality
         cache: false
 
-    - name: Install project in editable mode
-      shell: bash
-      run: pixi run -e quality install-editable
-
     - name: Verify environment
       shell: bash
       run: |
@@ -44,7 +40,7 @@ jobs:
     - name: Run tests
       shell: bash
       run: |
-        pixi run -e quality pytest tests/ --cov=src/uckn --cov-report=xml -v
+        PYTHONPATH=src pixi run -e quality pytest tests/ --cov=src/uckn --cov-report=xml -v
 
     - name: Upload coverage to Codecov
       if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11'
@@ -69,10 +65,6 @@ jobs:
         environments: quality
         cache: false
 
-    - name: Install project in editable mode
-      shell: bash
-      run: pixi run -e quality install-editable
-
     - name: Verify environment
       shell: bash
       run: |