Agent fixes

[inercia]

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[Copilot]

Pull Request Overview

This PR primarily reduces log verbosity by downgrading many Info/Printf statements to Debug, introduces a Warn logging method, and adds interactive conversation capabilities to the agent runtime and CLI.

• Add interactive loop to Agent.Run with per-turn user input and a new CagentRuntime.ContinueConversation method
• Replace numerous Info/Printf logs with Debug, add Logger.Warn, and adjust some messages to better reflect severity
• Update agent usage documentation to reflect interactive usage and configuration

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pkg/server/server.go	Downgrade tool execution log from Info to Debug for less noisy logs.
pkg/common/panic.go	Change recovered panic logs to Debug; still logs to stderr.
pkg/common/logging.go	Change init logs to Debug and add Warn method on Logger.
pkg/common/constraints.go	Downgrade constraint evaluation logs to Debug.
pkg/command/runner_sandbox.go	Change operational logs to Debug for sandbox-exec runner.
pkg/command/runner_firejail.go	Change operational logs to Debug for firejail runner.
pkg/command/runner_exec.go	Change execution logs to Debug and keep behavior; minor messaging tweaks.
pkg/command/runner_docker.go	Change Docker execution logs to Debug.
pkg/command/runner.go	Downgrade implicit requirements failure log to Debug.
pkg/command/command_exec.go	Downgrade tool completion log to Debug.
pkg/command/command.go	Downgrade constraint compilation logs to Debug.
pkg/agent/model.go	Use Warn when falling back to OpenAI-compatible model class.
pkg/agent/cagent_runtime.go	Add ContinueConversation and convert logs to Debug; initialize single-agent runtime.
pkg/agent/agent.go	Implement interactive conversation loop, improved exit handling, and better user prompts.
docs/usage-agent.md	Update agent usage guide; fix flow and examples, but introduces minor typos.
cmd/exe.go	Downgrade "Executing tool" log to Debug.
cmd/agent.go	Improve error handling messaging for context cancellations and clarify prompt usage.

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