data: add TRREB and CMHC raw data files

- TRREB Market Watch PDFs (2024-2025, 24 files)
- CMHC Rental Market Survey Excel files (2021-2025, 5 files)
- Update pre-commit to exclude data/raw/ from large file check

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.pre-commit-config.yaml

@@ -7,6 +7,7 @@ repos:
       - id: check-yaml
       - id: check-added-large-files
         args: ['--maxkb=1000']
+        exclude: ^data/raw/
       - id: check-merge-conflict
 
   - repo: https://github.com/astral-sh/ruff-pre-commit