docs: add implementation plan, ADRs, and task tracking system

- Add comprehensive 8-phase implementation plan (docs/plan.md)
- Add 28 Architecture Decision Records (docs/adr/) covering all phases
- Add task tracking system with 283+ task files (docs/stories/)
- Add task generator script for automated task file creation
- Add reference playbooks and requirements documentation

This commit establishes the complete planning foundation for the Go
Platform implementation, documenting all architectural decisions and
providing detailed task breakdown for Phases 0-8.

docs/stories/phase0/0.2.4-create-configuration-files.md

@@ -0,0 +1,67 @@
+# Task 0.2.4: Create Configuration Files
+
+## Metadata
+- **Task ID**: 0.2.4
+- **Title**: Create Configuration Files
+- **Phase**: 0 - Project Setup & Foundation
+- **Section**: 0.2 Configuration System
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: 15 minutes
+- **Dependencies**: 0.1.2
+
+## Description
+Create the baseline configuration YAML files that define the default configuration structure for the platform.
+
+## Requirements
+- Create `config/default.yaml` with baseline values
+- Create `config/development.yaml` with development overrides
+- Create `config/production.yaml` with production overrides
+- Define configuration schema for all core services
+
+## Implementation Steps
+1. Create `config/default.yaml`:
+   ```yaml
+   environment: development
+   server:
+     port: 8080
+     host: "0.0.0.0"
+   database:
+     driver: "postgres"
+     dsn: ""
+   logging:
+     level: "info"
+     format: "json"
+   ```
+2. Create `config/development.yaml`:
+   - Override logging level to "debug"
+   - Add development-specific settings
+3. Create `config/production.yaml`:
+   - Override logging level to "warn"
+   - Add production-specific settings
+4. Document configuration options
+
+## Acceptance Criteria
+- [ ] `config/default.yaml` exists with complete structure
+- [ ] `config/development.yaml` exists
+- [ ] `config/production.yaml` exists
+- [ ] All configuration files are valid YAML
+- [ ] Configuration structure is documented
+
+## Related ADRs
+- [ADR-0004: Configuration Management](../../adr/0004-configuration-management.md)
+
+## Implementation Notes
+- Use consistent indentation (2 spaces)
+- Add comments for unclear configuration options
+- Use environment variables for sensitive values (DSN, secrets)
+- Consider adding validation schema later
+
+## Testing
+```bash
+# Validate YAML syntax
+yamllint config/*.yaml
+# or
+python3 -c "import yaml; yaml.safe_load(open('config/default.yaml'))"
+```
+