ci: add daily failover simulation schedule and standardize service configurations

Add daily 2 AM cron schedule for node failover simulation workflow. Relax AITBC address validation to support variable-length addresses. Add missing logging import to chain_sync. Make coordinator database initialization non-fatal to allow startup even if init_db fails. Replace Ethereum address validation with AITBC-specific format checks in multisig transactions. Standardize PYTHONPATH across all systemd services to include

docs/development/PRE_COMMIT_HOOKS.md

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+# Pre-Commit Hooks
+
+This project uses pre-commit hooks to ensure code quality and consistency before commits.
+
+## Installation
+
+```bash
+# Install pre-commit (if not already installed)
+pip install pre-commit
+
+# Install the hooks
+pre-commit install
+
+# Install pre-commit hooks for all files (optional)
+pre-commit install --hook-type pre-push
+```
+
+## Usage
+
+### Running hooks manually
+
+```bash
+# Run on all files
+pre-commit run --all-files
+
+# Run on staged files only (what happens during commit)
+pre-commit run
+
+# Run specific hooks
+pre-commit run black flake8 mypy
+```
+
+### Automatic execution
+
+Hooks run automatically on `git commit` for staged files. If a hook fails, the commit will be blocked. Fix the issues and try again.
+
+To bypass hooks (not recommended):
+```bash
+git commit --no-verify
+```
+
+## Available Hooks
+
+### Python
+- **black**: Code formatting
+- **flake8**: Linting (max line length: 120)
+- **mypy**: Type checking
+- **bandit**: Security scanning
+
+### General
+- **trailing-whitespace**: Remove trailing whitespace
+- **end-of-file-fixer**: Ensure newline at end of file
+- **check-yaml**: Validate YAML syntax
+- **check-toml**: Validate TOML syntax
+- **check-json**: Validate JSON syntax
+- **check-added-large-files**: Prevent large files (>1MB)
+- **detect-private-key**: Detect private keys in code
+- **mixed-line-ending**: Ensure consistent line endings (LF)
+
+### Configuration Files
+- **yamllint**: YAML linting with custom config
+- **markdownlint**: Markdown linting (excludes docs/archive)
+
+### JavaScript/TypeScript
+- **eslint**: JavaScript/TypeScript linting for packages/js and cli
+
+### Shell Scripts
+- **shellcheck**: Shell script linting
+
+## Configuration
+
+- **.pre-commit-config.yaml**: Main pre-commit configuration
+- **.yamllint.yaml**: YAML linting rules
+
+## Updating Hooks
+
+```bash
+# Update hook versions
+pre-commit autoupdate
+
+# Review changes
+git diff .pre-commit-config.yaml
+```
+
+## Exclusions
+
+Hooks exclude common directories:
+- venv/, .venv/ (Python virtual environments)
+- build/, dist/ (Build artifacts)
+- docs/archive/ (Archived documentation)
+
+## Troubleshooting
+
+### Hook fails but you think it's wrong
+Check the specific hook documentation and configuration. Some rules may need adjustment for the project.
+
+### Pre-commit not running
+Ensure hooks are installed:
+```bash
+pre-commit install
+```
+
+### Slow execution
+Run hooks on specific files only:
+```bash
+pre-commit run <hook-name> <files...>
+```