agama-project / agama / 26016589058

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Support agama monitor without a terminal (#3510)

## Summary
Enables `agama monitor` to run in environments without a TTY (systemd
services, automation, background processes). It solves a problem with
prevents the autoinstallation, given that the terminal is not available
when running as a systemd service (`agama-autoinstall` is a systemd
service).

We should consider this one a critical error to besolved before release
version 21.

<details>
<summary>Error during auto-installation</summary>

<img width="1280" height="800" alt="autoinstall-error"
src="https://github.com/user-attachments/assets/43c7cb1f-aa78-4296-8d7b-0c4d7d4b8b92"
/>
</details>

## Changes
- Auto-detect terminal availability using `std::io::IsTerminal`
- Add headless mode with plain text output
- Move monitoring logic from agama-cli to agama-lib (better
architecture)
- Monitor owns stop_on_idle logic and emits status updates
- Return Receiver directly (removed MonitorClient wrapper)
- Channel closure properly signals completion (idiomatic Rust)

## Result
- Works in both TUI and headless modes automatically
- -141 lines of code
- Cleaner API and architecture
- Channel closes correctly when monitoring stops

4278 of 6368 branches covered (67.18%)

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