Add configuration management commands to uwf CLI:
- uwf config list: display all config values (masks API keys)
- uwf config get <key>: retrieve specific value using dot notation
- uwf config set <key> <value>: update config value with auto-creation
Implementation:
- New file packages/cli-workflow/src/commands/config.ts with helper functions
- Comprehensive test coverage (32 tests) in config.test.ts
- Supports nested path navigation via dot notation
- Auto-creates intermediate objects when setting new paths
- Masks apiKeyEnv values in list output for security
Resolves#526
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>