Add live config reload, session locking and managed daemons

Refine focus gradients, shell workspace controls and popup motion. Correct floating stacking and preserve client-chosen dialog sizes. Add lock protocol probes and session integration.

compositor/src/daemon.rs

@@ -0,0 +1,97 @@
+//! Session-owned services. Never grant shell/effects privileges to daemons.
+use crate::{Ferese, config::DaemonConfig, private_client::ClientCapabilities};
+use std::{
+    process::Child,
+    time::{Duration, Instant},
+};
+
+struct Service {
+    config: DaemonConfig,
+    child: Option<Child>,
+    next_start: Instant,
+    finished: bool,
+}
+
+pub(crate) struct Runner(Vec<Service>);
+
+impl Runner {
+    pub fn new(configs: &[DaemonConfig], nested: bool) -> Self {
+        Self(
+            configs
+                .iter()
+                .filter(|config| !nested || config.nested)
+                .map(|config| Service {
+                    config: config.clone(),
+                    child: None,
+                    next_start: Instant::now(),
+                    finished: false,
+                })
+                .collect(),
+        )
+    }
+
+    pub fn tick(&mut self, state: &mut Ferese) {
+        let now = Instant::now();
+        for service in &mut self.0 {
+            if let Some(child) = &mut service.child {
+                match child.try_wait() {
+                    Ok(Some(status)) => {
+                        tracing::info!(command = ?service.config.command, %status, "session daemon exited");
+                        service.child = None;
+                        service.finished = !service.config.restart;
+                        service.next_start = now + Duration::from_secs(5);
+                    }
+                    Ok(None) => continue,
+                    Err(error) => {
+                        tracing::warn!(%error, "cannot reap session daemon");
+                        continue;
+                    }
+                }
+            }
+            if !service.finished && now >= service.next_start {
+                service.child = crate::spawn_client(
+                    state,
+                    service.config.command.iter().map(Into::into).collect(),
+                    ClientCapabilities::default(),
+                );
+                service.next_start = now + Duration::from_secs(5);
+                if service.child.is_none() && !service.config.restart {
+                    service.finished = true;
+                }
+            }
+        }
+    }
+
+    pub fn stop(&mut self) {
+        for service in &mut self.0 {
+            if let Some(mut child) = service.child.take() {
+                crate::terminate_child(&mut child);
+            }
+            service.finished = true;
+        }
+    }
+}
+
+impl Drop for Runner {
+    fn drop(&mut self) {
+        self.stop();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn previews_do_not_duplicate_session_daemons() {
+        let configs = vec![DaemonConfig {
+            command: vec!["awari".into()],
+            restart: true,
+            nested: false,
+        }];
+        assert!(Runner::new(&configs, true).0.is_empty());
+        let mut direct = Runner::new(&configs, false);
+        assert_eq!(direct.0.len(), 1);
+        direct.stop();
+        assert!(direct.0[0].finished);
+    }
+}