Clean up: Remove old numbered .yml files, CLI uses module.yaml

CLEANUP: Removed duplicate/obsolete configuration files

Removed Files:
- All old numbered .yml files (02_tensor.yml, 03_activations.yml, etc.)
- These were leftover from the module reorganization
- Had incorrect dependencies (still referenced 'setup')

Current State:
✅ CLI correctly uses module.yaml files (19 modules)
✅ All module.yaml files have correct dependencies
✅ No more duplicate/conflicting configuration files
✅ Clean module structure with single source of truth

The CLI was already using module.yaml correctly, so this cleanup removes
the confusing duplicate files without affecting functionality.

modules/06_optimizers/07_optimizers.yml

@@ -1,30 +0,0 @@
-# TinyTorch Module Metadata
-# Essential system information for CLI tools and build systems
-
-name: "optimizers"
-title: "Optimizers"
-description: "Gradient-based parameter optimization algorithms"
-
-# Dependencies - Used by CLI for module ordering and prerequisites
-dependencies:
-  prerequisites: ["setup", "tensor", "autograd"]
-
-# Package Export - What gets built into tinytorch package
-exports_to: "tinytorch.core.optimizers"
-
-# File Structure - What files exist in this module
-files:
-  dev_file: "optimizers_dev.py"
-  readme: "README.md"
-  tests: "inline"
-
-# Educational Metadata
-difficulty: "⭐⭐⭐⭐"
-time_estimate: "6-8 hours"
-
-# Components - What's implemented in this module
-components:
-  - "SGD"
-  - "Adam"
-  - "StepLR"
-  - "gradient_descent_step"