Implements the `paseo agent run` command for creating and running agents:
- Creates agent with initial prompt
- `-d, --detach` flag for background execution
- `--name <name>` to assign a title
- `--provider <provider>` to select claude/codex/opencode
- `--mode <mode>` for provider-specific modes
- `--cwd <path>` for working directory
- Supports all output formats (table, json, yaml, quiet)
- Graceful error handling when daemon not running
Usage:
paseo agent run "Fix the failing tests"
paseo agent run -d --name "test-fixer" "Run the test suite"
paseo agent run --mode bypass "Refactor the auth module"
Phase 4 of CLI implementation (TDD checklist 4.1-4.6)