Add validation modules for real estate responses

- Implemented RealEstateHallucinationDetector to identify unrealistic percentages and large price figures in responses.
- Created PriceValidator to validate price information based on property type and regional multipliers, including checks for price per square foot and total price consistency.
- Developed ROIValidator to validate ROI projections, cap rates, and cash-on-cash returns, ensuring they fall within reasonable ranges and checking for consistency across financial metrics.
- Added PriceConsistencyValidator to ensure consistency among multiple price mentions within a response.

Author: DavidNart90

.flake8

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+[flake8]
+max-line-length = 120
+ignore = 
+    # W293: blank line contains whitespace
+    W293,
+    # W291: trailing whitespace
+    W291,
+    # E128: continuation line under-indented for visual indent
+    E128,
+    # F401: imported but unused (for development)
+    F401
+exclude = 
+    __pycache__,
+    .git,
+    .venv,
+    venv,
+    env,
+    .env,
+    build,
+    dist,
+    *.egg-info,
+    migrations
+
+# Focus on important errors
+select = 
+    E,   # pycodestyle errors
+    W,   # pycodestyle warnings
+    F,   # pyflakes
+    C,   # complexity
+
+# Exclude some less critical warnings during development
+per-file-ignores =
+    __init__.py:F401

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[codz]
+*$py.class
+
+# C extensions
+*.so
+
+.vscode/
+logs/
+logs/*
+
+# Cache directories
+cache/
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py.cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+#poetry.toml
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#   pdm recommends including project-wide configuration in pdm.toml, but excluding .pdm-python.
+#   https://pdm-project.org/en/latest/usage/project/#working-with-version-control
+#pdm.lock
+#pdm.toml
+.pdm-python
+.pdm-build/
+
+# pixi
+#   Similar to Pipfile.lock, it is generally recommended to include pixi.lock in version control.
+#pixi.lock
+#   Pixi creates a virtual environment in the .pixi directory, just like venv module creates one
+#   in the .venv directory. It is recommended not to include this directory in version control.
+.pixi
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.env.test
+.env.example
+.env.local
+.envrc
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+ 
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+# Abstra
+# Abstra is an AI-powered process automation framework.
+# Ignore directories containing user credentials, local state, and settings.
+# Learn more at https://abstra.io/docs
+.abstra/
+
+# Visual Studio Code
+#  Visual Studio Code specific template is maintained in a separate VisualStudioCode.gitignore 
+#  that can be found at https://github.com/github/gitignore/blob/main/Global/VisualStudioCode.gitignore
+#  and can be added to the global gitignore or merged into this file. However, if you prefer, 
+#  you could uncomment the following to ignore the entire vscode folder
+# .vscode/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# Cursor
+#  Cursor is an AI-powered code editor. `.cursorignore` specifies files/directories to
+#  exclude from AI features like autocomplete and code analysis. Recommended for sensitive data
+#  refer to https://docs.cursor.com/context/ignore-files
+.cursorignore
+.cursorindexingignore
+
+# Marimo
+marimo/_static/
+marimo/_lsp/
+__marimo__/
+
+
+# Local development files
+cache/embeddings/ `# Cache for embeddings, can be large and specific to local development
+
+
+API_TESTING_GUIDE.md
+CLI_FUNCTIONALITY_SUMMARY.md
+CLI_README.md
+cli_requirements.txt
+demo_cli.py
+final_testing.md
+performance_improvements_summary.md
+Phase3_Implementation_Summary.md
+PROMPT_ANALYSIS_FRAMEWORK.md
+ROI_Deep_Fix_Summary.md
+SINGLE_TEST_USAGE.md
+TASK_4.2_COMPLETION_SUMMARY.md
+
+
+# Testing files
+tests/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache

LINTING_GUIDE.md

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+# Pre-Commit Linting Guide
+
+## Quick Setup
+
+You now have flake8 installed and configured for your project. Here's how to lint your code before pushing:
+
+## Basic Commands
+
+### 1. Check for Critical Errors Only (Recommended for CI/CD)
+```bash
+flake8 src/trackrealties/ --select=F821,E999
+```
+This checks for:
+- F821: Undefined name errors (the ones causing your CI/CD failures)
+- E999: Syntax errors
+
+### 2. Full Linting Check
+```bash
+flake8 src/trackrealties/ --max-line-length=120
+```
+
+### 3. Check Specific Files
+```bash
+flake8 src/trackrealties/cli.py --select=F821
+flake8 src/trackrealties/rag/optimized_pipeline.py --select=F821
+```
+
+## Automated Pre-Commit Script
+
+Run our custom linting script:
+```bash
+python simple_lint.py
+```
+
+This script checks:
+- ✅ No undefined names (F821) or syntax errors (E999)
+- ✅ Python files compile successfully
+- ✅ Key imports work correctly
+
+## Configuration
+
+Your project now has a `.flake8` configuration file that:
+- Sets max line length to 120 characters
+- Ignores some cosmetic issues during development
+- Focuses on critical errors
+
+## Recommended Workflow
+
+Before committing/pushing:
+
+1. **Run critical checks:**
+   ```bash
+   python simple_lint.py
+   ```
+
+2. **If that passes, you're good to push!** Your CI/CD should now pass.
+
+3. **Optional: Full code style check:**
+   ```bash
+   flake8 src/trackrealties/cli.py --max-line-length=120
+   ```
+
+## What We Fixed
+
+- ✅ **Fixed undefined `location` variable** in `optimized_pipeline.py` (lines 1250, 1253)
+- ✅ **Fixed undefined `EnhancedDataIngestionEngine`** in `cli.py` → replaced with `EnhancedIngestionPipeline`
+- ✅ **Fixed undefined `DataIngestionEngine`** in `cli.py` → replaced with enhanced pipeline fallback
+- ✅ **Fixed undefined `ListingType`** in `cli.py` → added proper import and updated enum values
+- ✅ **Fixed undefined `MigrationRunner`** in `cli.py` → disabled with helpful error message
+- ✅ **Removed missing `DataValidator`** imports → disabled with helpful error messages
+
+All F821 undefined name errors have been resolved! 🎉