feat(tree): complete rust family runtime checklist

- add tree shell runtime artifact contracts and page/filetree/picker runtime reducers
- sink tree.subtree.move write operation through Rust and formalize command event plans
- harden file tree search projection contract and route thin-proxy boundaries
- record completed harness tasks and move design docs into process/done

rust/crates/mnote-web/src/tree_shell/renderer_input.rs

@@ -26,6 +26,7 @@ pub struct TreeShellRendererInput {
     pub excluded_picker_ids: BTreeSet<String>,
     pub picker_state_reducer: Option<PickerStateReducerContract>,
     pub command_dispatcher: TreeShellCommandDispatcher,
+    pub runtime_artifact: TreeShellRuntimeArtifactBoundary,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
@@ -35,6 +36,41 @@ pub struct TreeShellCommandDispatcher {
     pub command_names: BTreeSet<String>,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TreeShellRuntimeArtifactBoundary {
+    pub contract_name: &'static str,
+    pub input_fields: BTreeSet<&'static str>,
+    pub output_channels: BTreeSet<&'static str>,
+    pub event_kinds: BTreeSet<&'static str>,
+}
+
+impl Default for TreeShellRuntimeArtifactBoundary {
+    fn default() -> Self {
+        Self {
+            contract_name: "rust_tree_shell_runtime_artifact_v1",
+            input_fields: BTreeSet::from([
+                "rendererInput",
+                "projectionItems",
+                "expandedIds",
+                "selectedRowIds",
+                "activePickerItem",
+                "focusedId",
+            ]),
+            output_channels: BTreeSet::from(["domPatch", "intentEvent", "commandDispatchEvent"]),
+            event_kinds: BTreeSet::from([
+                "focus",
+                "keyboard",
+                "expandCollapse",
+                "selection",
+                "contextMenu",
+                "dragDrop",
+                "pick",
+            ]),
+        }
+    }
+}
+
 impl TreeShellRendererInput {
     pub fn page(input: PageTreeRendererInput) -> Self {
         Self {
@@ -49,6 +85,7 @@ impl TreeShellRendererInput {
             excluded_picker_ids: BTreeSet::new(),
             picker_state_reducer: None,
             command_dispatcher: input.command_dispatcher,
+            runtime_artifact: TreeShellRuntimeArtifactBoundary::default(),
         }
     }
 
@@ -65,6 +102,7 @@ impl TreeShellRendererInput {
             excluded_picker_ids: BTreeSet::new(),
             picker_state_reducer: None,
             command_dispatcher: input.command_dispatcher,
+            runtime_artifact: TreeShellRuntimeArtifactBoundary::default(),
         }
     }
 
@@ -81,6 +119,7 @@ impl TreeShellRendererInput {
             excluded_picker_ids: input.excluded_picker_ids,
             picker_state_reducer: Some(PickerStateReducerContract::default()),
             command_dispatcher: input.command_dispatcher,
+            runtime_artifact: TreeShellRuntimeArtifactBoundary::default(),
         }
     }
 }
@@ -113,8 +152,8 @@ pub struct PickerRendererInput {
 #[cfg(test)]
 mod tests {
     use super::{
-        FileTreeRendererInput, PageTreeRendererInput, PickerRendererInput, TreeShellCommandDispatcher,
-        TreeShellRendererInput, TreeShellRendererMode,
+        FileTreeRendererInput, PageTreeRendererInput, PickerRendererInput,
+        TreeShellCommandDispatcher, TreeShellRendererInput, TreeShellRendererMode,
     };
     use crate::tree_shell::filetree_selection::FileTreeSelectionState;
     use std::collections::BTreeSet;
@@ -158,7 +197,10 @@ mod tests {
         });
         assert_eq!(filetree.mode, TreeShellRendererMode::FileTree);
         assert_eq!(filetree.focused_id.as_deref(), Some("asset:a"));
-        assert!(filetree.filetree_selection.selected_row_ids.contains("asset:a"));
+        assert!(filetree
+            .filetree_selection
+            .selected_row_ids
+            .contains("asset:a"));
         assert!(filetree.page_focus_keyboard_reducer.is_none());
         assert_eq!(
             filetree
@@ -188,4 +230,36 @@ mod tests {
             Some("rust_picker_state_reducer_v1")
         );
     }
+
+    #[test]
+    fn tree_shell_renderer_input_exposes_runtime_artifact_boundary() {
+        let page = TreeShellRendererInput::page(PageTreeRendererInput {
+            projection_item_ids: vec!["doc:root".into()],
+            expanded_ids: set(&["doc:root"]),
+            focused_id: Some("doc:root".into()),
+            command_dispatcher: dispatcher(),
+        });
+
+        let artifact = page.runtime_artifact;
+        assert_eq!(
+            artifact.contract_name,
+            "rust_tree_shell_runtime_artifact_v1"
+        );
+        assert!(artifact.input_fields.contains("rendererInput"));
+        assert!(artifact.input_fields.contains("projectionItems"));
+        assert!(artifact.input_fields.contains("expandedIds"));
+        assert!(artifact.input_fields.contains("selectedRowIds"));
+        assert!(artifact.input_fields.contains("activePickerItem"));
+        assert!(artifact.input_fields.contains("focusedId"));
+        assert!(artifact.output_channels.contains("domPatch"));
+        assert!(artifact.output_channels.contains("intentEvent"));
+        assert!(artifact.output_channels.contains("commandDispatchEvent"));
+        assert!(artifact.event_kinds.contains("focus"));
+        assert!(artifact.event_kinds.contains("keyboard"));
+        assert!(artifact.event_kinds.contains("expandCollapse"));
+        assert!(artifact.event_kinds.contains("selection"));
+        assert!(artifact.event_kinds.contains("contextMenu"));
+        assert!(artifact.event_kinds.contains("dragDrop"));
+        assert!(artifact.event_kinds.contains("pick"));
+    }
 }