AGENTS.md and use of Opencode sessions

AGENTS.md

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+# Guide for AI Agents
+
+## Project Overview
+
+Internator is a Ruby CLI gem that automates iterative pull request improvements using the `opencode` CLI. It cycles through objectives, makes incremental changes, automatically commits and pushes each update, and optionally waits between iterations.
+
+## Key Components
+
+- **CLI (`lib/internator/cli.rb`)**: Main entry point handling argument parsing, git operations, and the iteration loop
+- **OpencodeService (`lib/internator/opencode_service.rb`)**: Executes `opencode run` commands with proper shell escaping
+
+## Development Guidelines
+
+### Code Style
+
+1. **No excessive comments**: If the method name is self-explanatory, comments are unnecessary
+2. **No trailing newlines**: Treat files as if saved with Vim's `set binary` and `set noeol`
+3. **Ruby conventions**: Follow standard Ruby style guidelines
+
+## Configuration
+
+Users can customize behavior via `~/.internator_config.yml`:
+
+```yaml
+instructions: |
+  Custom instructions here...
+```