can choose per mode models for auto mode

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Added
+
+**Interactive Requirements Mode**
+- **Interactive Requirements Entry**: New `--interactive-requirements` flag for autonomous mode
+  - Prompts user to enter requirements via stdin (multi-line support)
+  - Automatically saves requirements to `requirements.md` in workspace
+  - Shows preview of entered requirements
+  - Seamlessly transitions to autonomous mode
+
+**Autonomous Mode Configuration**
+- **Autonomous Mode Configuration**: Added ability to specify different models for coach and player agents in autonomous mode
+  - New `[autonomous]` configuration section in `g3.toml`
+  - `coach_provider` and `coach_model` options for coach agent
+  - `player_provider` and `player_model` options for player agent
+  - `Config::for_coach()` and `Config::for_player()` methods to generate role-specific configurations
+  - Comprehensive test suite for autonomous configuration
+
+### Changed
+- Autonomous mode now uses `config.for_player()` for the player agent
+- Coach agent creation now uses `config.for_coach()` for the coach agent
+
+### Benefits
+- **Cost Optimization**: Use cheaper models for execution, expensive models for review
+- **Speed Optimization**: Use faster models for iteration, thorough models for validation
+- **Specialization**: Leverage different providers' strengths for different roles