feat(editor): EditorProposalController — optimistic apply + decorations + CodeLens (#64)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/extension.ts

@@ -13,6 +13,7 @@ import { DiffViewController } from "./diffViewController";
 import { TrackChangesPreviewController } from "./trackChangesPreview";
 import { LiveProgressUi } from "./liveProgressUi";
 import { InlineAskController } from "./inlineAsk";
+import { EditorProposalController } from "./editorProposalController";
 import { isAuthorable, routeEdit, selectionRejection } from "./workspacePath";
 
 const CHANNEL_NAME = "Cowriting (Cline SDK)";
@@ -27,6 +28,7 @@ export interface CowritingApi {
   sidecarRouter: SidecarRouter;
   liveProgressUi: LiveProgressUi;
   inlineAsk: InlineAskController;
+  editorProposalController: EditorProposalController;
 }
 
 export function activate(context: vscode.ExtensionContext): CowritingApi | undefined {
@@ -123,6 +125,11 @@ export function activate(context: vscode.ExtensionContext): CowritingApi | undef
   );
   context.subscriptions.push(trackChangesPreviewController);
 
+  // --- F12 (#64): the editor surface — optimistic-apply proposals into the buffer,
+  // decorate the diff, and provide Accept ▾/Reject ▾ CodeLens (INV-48/49/52/53). ---
+  const editorProposalController = new EditorProposalController(proposalController);
+  context.subscriptions.push(editorProposalController);
+
   // #46 (INV-42): accept every pending proposal on the active doc in one gesture
   // (also reachable from the preview toolbar's "Accept all" button). Reuses the
   // batched F4 seam + reports applied-vs-skipped.
@@ -345,6 +352,7 @@ export function activate(context: vscode.ExtensionContext): CowritingApi | undef
     sidecarRouter,
     liveProgressUi,
     inlineAsk,
+    editorProposalController,
   };
 }