feat(config): implement three-scope config resolution with local config file support
Implement three-scope configuration resolution (local > project > global) with deep merge. Add ConfigScope enum, project-root discovery, and config.local.toml file support. Changes: - Add LOCAL to ConfigLevel enum and new ConfigScope enum (GLOBAL, PROJECT, LOCAL) - Implement discover_project_root() walking up from CWD for cleveragents.toml/.cleveragents - Implement config.local.toml file loading in ConfigService - Implement three-scope deep merge via _deep_merge() helper - Add read_project_config(), read_local_config(), read_merged_config() methods - Add write_scoped_config() for writing to any scope file - Update set_value() to accept optional scope parameter - Update resolve() with six-level precedence chain (CLI > env > local > project > global > default) - Update CLI config set with --scope flag (global/project/local) - Add config.local.toml to .gitignore and DEFAULT_IGNORE_PATTERNS - Add Behave BDD scenarios for three-scope resolution, deep merge, and project-root discovery ISSUES CLOSED: #937
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