fix: repair broken workflow outputs in comprehensive-testing.yml

CRITICAL FIX: Workflow syntax error was preventing ALL checks from running

ISSUE:
- outputs section referenced wrong step ID (steps.filter.outputs.any_changed)
- The any_changed output is actually set by the set-output step
- This caused workflow to fail parsing and no checks to run

SOLUTION:
- Fix outputs reference to use correct step ID: steps.set-output.outputs.any_changed
- Add missing id: set-output to the step that sets the output

This should restore normal CI check execution.

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <[email protected]>

Author: MementoRC

.github/workflows/comprehensive-testing.yml

@@ -17,7 +17,7 @@ jobs:
   changed-files:
     runs-on: ubuntu-latest
     outputs:
-      any_changed: ${{ steps.filter.outputs.any_changed }}
+      any_changed: ${{ steps.set-output.outputs.any_changed }}
     steps:
       - uses: actions/checkout@v4
       - id: filter
@@ -35,6 +35,7 @@ jobs:
               - 'requirements.txt'
               - 'setup.cfg'
       - name: Set output if any relevant files changed
+        id: set-output
         run: echo "any_changed=${{ steps.filter.outputs.src == 'true' || steps.filter.outputs.tests == 'true' || steps.filter.outputs.config == 'true' || steps.filter.outputs.workflows == 'true' }}" >> $GITHUB_OUTPUT
 
   test: