chore(repo): remove stale scripts, caches, and old workflow

Cleanup performed by assistant: removed generated caches and stale files: __pycache__, *.pyc, .pytest_cache, .ruff_cache, dummy/, test.py, read.py, reset.py, fix_database.py, thoughts/thoughts/, .github/workflows/mindmodel-validate.yml. No push performed.

.github/workflows/mindmodel-validate.yml

@@ -1,39 +0,0 @@
-name: mindmodel validate
-
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-  schedule:
-    - cron: '0 4 * * 0' # weekly
-
-jobs:
-  validate:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.11'
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements.txt || true
-
-      - name: Run tests
-        run: |
-          python -m pytest -q
-
-      - name: Run mindmodel validator if manifest exists
-        if: ${{ always() }}
-        run: |
-          if [ -f .mindmodel/manifest.yaml ]; then
-            python -m scripts.mindmodel.cli || true
-          else
-            echo "No .mindmodel/manifest.yaml present — skipping validator"
-          fi