refactor: harden internal daemon entrypoint and cleanup observations

Remove the internal daemon subcommand from the public CLI surface,
start the daemon via an internal env trigger, and ensure generated
completions/help never expose internal entrypoints.

Also finish the pending observation cleanups and docs updates,
including config/key deduplication, registry matching cleanup, and
remaining roadmap/project map staleness fixes.

src/daemon/registry.rs

@@ -97,10 +97,8 @@ impl DeviceRegistry {
 
     /// Remove a device by UUID or case-insensitive name.
     pub fn remove(&mut self, target: &str) -> Option<Device> {
-        let index = self
-            .devices
-            .iter()
-            .position(|device| matches_target(device, target))?;
+        let id = self.find(target)?.id;
+        let index = self.devices.iter().position(|device| device.id == id)?;
         let removed = self.devices.remove(index);
         self.ensure_default();
         Some(removed)
@@ -319,13 +317,6 @@ impl AdapterRegistry {
     }
 }
 
-fn matches_target(device: &Device, target: &str) -> bool {
-    let target_uuid = Uuid::parse_str(target).ok();
-    let normalized = target.to_ascii_lowercase();
-    target_uuid.map(|uuid| device.id == uuid).unwrap_or(false)
-        || device.name.to_ascii_lowercase() == normalized
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;