feat: unify object observation API

crates/wip-host/src/lib.rs

@@ -352,7 +352,7 @@ impl InterfaceRegistry {
 
     /// Observes a registered interface by its host-side reference.
     #[must_use]
-    pub fn observe(&self, reference: &InterfaceRef) -> Option<InterfaceObservation> {
+    pub fn observe_object(&self, reference: &InterfaceRef) -> Option<InterfaceObservation> {
         self.artifacts.get(reference).map(Self::observation)
     }
 
@@ -863,13 +863,13 @@ pub trait ObjectProvider {
         true
     }
 
-    /// Fetches the canonical object projection currently published at `path`.
-    fn fetch(&self, path: &str) -> Result<Object, CallError> {
-        self.fetch_with_context(&ExecutionContext::default(), path)
+    /// Observes the canonical object projection currently published at `path`.
+    fn observe_object(&self, path: &str) -> Result<Object, CallError> {
+        self.observe_object_with_context(&ExecutionContext::default(), path)
     }
 
-    /// Fetches an object while propagating runtime execution controls.
-    fn fetch_with_context(
+    /// Observes an object while propagating runtime execution controls.
+    fn observe_object_with_context(
         &self,
         context: &ExecutionContext,
         path: &str,
@@ -882,7 +882,7 @@ pub trait ObjectProvider {
         .map_err(|_| {
             CallError::new(
                 CallErrorKind::Internal,
-                "provider panicked while fetching an object",
+                "provider panicked while observing an object",
             )
         })?;
         let object = match resolved {