Update configuration and test structure for improved clarity and functionality

- Modified `.gitignore` to include test fixture data while excluding test results.
- Updated `config.yaml` to change the model from 'yolo11m.yaml' to 'yolo26m.pt'.
- Enhanced `.cursor/rules/coderule.mdc` with additional guidelines for test environment consistency and infrastructure handling.
- Revised autopilot state management in `_docs/_autopilot_state.md` to reflect current progress and tasks.
- Removed outdated augmentation tests and adjusted dataset formation tests to align with the new structure.

These changes streamline the configuration and testing processes, ensuring better organization and clarity in the project.

_docs/04_refactoring/01-code-improvements/baseline_metrics.md

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+# Baseline Metrics
+
+**Run**: 01-code-improvements
+**Date**: 2026-03-28
+**Mode**: Guided
+**Source**: `_docs/02_document/refactoring_notes.md`
+
+## Goals
+
+Apply 5 improvements identified during documentation:
+1. Update YOLO to v26m version
+2. Replace external augmentation with YOLO built-in augmentation
+3. Remove processed folder — use data dir directly
+4. Use hard symlinks instead of file copies for dataset formation
+5. Unify constants directories — remove `src/annotation-queue/config.yaml`
+
+## Code Metrics
+
+| Metric | Value |
+|--------|-------|
+| Source files (src/) | 24 Python files |
+| Source LOC | 2,945 |
+| Test files | 21 Python files |
+| Test LOC | 1,646 |
+| Total tests | 83 (77 blackbox/unit + 6 performance) |
+| Test execution time | ~130s (120s unit + 10s perf) |
+| Python version | 3.10.8 |
+| Ultralytics version | 8.4.30 |
+| Pip packages | ~76 |
+
+## Files Affected by Refactoring
+
+| File | LOC | Refactoring Items |
+|------|-----|-------------------|
+| `src/constants.py` | 118 | #3 (remove processed_dir), #5 (unify config) |
+| `src/train.py` | 178 | #1 (YOLO version), #2 (built-in aug), #3 (data dir), #4 (symlinks) |
+| `src/augmentation.py` | 152 | #2 (replace with YOLO built-in), #3 (processed dir) |
+| `src/exports.py` | 118 | #3 (processed dir references) |
+| `src/convert-annotations.py` | 119 | #3 (processed dir references) |
+| `src/dataset-visualiser.py` | 52 | #3 (processed dir references) |
+| `src/annotation-queue/annotation_queue_handler.py` | 173 | #5 (remove separate config.yaml) |
+| `src/annotation-queue/config.yaml` | 21 | #5 (delete — duplicated config) |
+| `config.yaml` | 30 | #5 (single source of truth) |
+
+## Test Suite Baseline
+
+```
+77 passed, 0 failed, 0 skipped (blackbox/unit)
+6 passed, 0 failed, 0 skipped (performance)
+Total: 83 passed in ~130s
+```
+
+## Functionality Inventory
+
+| Feature | Status | Affected by Refactoring |
+|---------|--------|------------------------|
+| Augmentation pipeline | Working | Yes (#2, #3) |
+| Dataset formation | Working | Yes (#3, #4) |
+| Training | Working | Yes (#1, #2) |
+| Model export (ONNX) | Working | No |
+| Inference (ONNX/TensorRT) | Working | No |
+| Annotation queue | Working | Yes (#5) |
+| API client | Working | No |
+| CDN manager | Working | No |
+| Security/encryption | Working | No |
+| Label validation | Working | No |