Add proper interactive mode when no prompt is provided:
**Interactive REPL Features**:
- Starts when running `cargo run` with no arguments
- Shows welcome message with model name
- Prompts with `> ` for user input
- Each input runs through the full agent loop with tools
- Continues until Ctrl+C or EOF
- Displays tool calls and results in real-time
**Changes**:
- Detect empty prompt and enter interactive loop
- Use stdin.lines() for reading user input
- Call agent_core::run_agent_loop for each message
- Handle errors gracefully and continue
- Clean up unused imports
**Usage**:
```bash
# Interactive mode
cargo run
# Single prompt mode
cargo run -- --print "Find all Cargo.toml files"
# Tool subcommands
cargo run -- glob "**/*.rs"
```
Example session:
```
🤖 Owlen Interactive Mode
Model: qwen3:8b
> Find all markdown files
🔧 Tool call: glob with args: {"pattern":"**/*.md"}
✅ Tool result: ./README.md ./CLAUDE.md ./AGENTS.md
...
> exit
```
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
vikingowl
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