F10 SLICE-3: wire ProposalController into the review preview (#29)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/extension.ts

@@ -89,21 +89,23 @@ export function activate(context: vscode.ExtensionContext): CowritingApi | undef
   const attributionController = new AttributionController(sidecarRouter, root, versionGuard);
   context.subscriptions.push(attributionController);
 
-  // --- F7: rendered track-changes preview (Feature #21) + F9 authorship mode ---
+  // --- F4: propose/accept (Feature #12) — constructed before the preview so F10
+  // can route ✓/✗ through it ---
+  const proposalController = new ProposalController(sidecarRouter, attributionController, root, versionGuard);
+  context.subscriptions.push(proposalController);
+
+  // --- F7/F10: the review preview is the single interactive review surface ---
   // Workspace-INDEPENDENT (works on any markdown doc, reuses the F6 baseline,
-  // INV-20). Constructed AFTER attribution so F9's authorship view can read F3
-  // spans (AttributionController.spansFor).
+  // INV-20). Constructed AFTER attribution (reads F3 spans) and proposals (routes
+  // F4 accept/reject from the webview ✓/✗).
   const trackChangesPreviewController = new TrackChangesPreviewController(
     diffViewController,
     context.extensionUri,
     attributionController,
+    proposalController,
   );
   context.subscriptions.push(trackChangesPreviewController);
 
-  // --- F4: propose/accept (Feature #12) ---
-  const proposalController = new ProposalController(sidecarRouter, attributionController, root, versionGuard);
-  context.subscriptions.push(proposalController);
-
   // --- F6 machine-landing wiring — now for ANY authorable doc ---
   // The seam's single machine-landing signal advances the F6 baseline (INV-18);
   // the seam can now fire on out-of-folder files too, so wire it unconditionally.