Update project documentation and code comments to remove platform-specific references

Refactor documentation files and code comments to remove references to Replit, specific task numbers, and other platform-specific identifiers.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 77cfe984-2c65-4152-bb7a-0df28274fe66
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: fa18e5d4-a810-4bd5-8cde-2a60d64d9e3f
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/c3c252e4-c83d-40ca-9fff-99a3ea60701e/77cfe984-2c65-4152-bb7a-0df28274fe66/kI0sxlu
Replit-Helium-Checkpoint-Created: true

artifacts/tx-os/src/hooks/use-notifications-socket.ts

@@ -301,7 +301,7 @@ export function useNotificationsSocket() {
       invalidate(["notes"]);
     });
 
-    // Task #438: a collaborator (owner or another recipient) toggled a
+    // a collaborator (owner or another recipient) toggled a
     // checklist item — refetch so this user's open thread / popup /
     // cards reflect the shared state. Server already updates the
     // emitter optimistically, so it never receives its own echo. We
@@ -335,7 +335,7 @@ export function useNotificationsSocket() {
         if (typeof payload?.folderId === "number") {
           invalidate(["notes", "shared-folder", payload.folderId]);
         }
-        // Task #454: this event also fanouts to the OWNER + every other
+        // this event also fanouts to the OWNER + every other
         // recipient when an editor mutates the folder's notes (create /
         // patch / delete / checklist toggle), so refresh the owner's
         // personal notes list and the folders rail badge counts too.
@@ -343,7 +343,7 @@ export function useNotificationsSocket() {
         invalidate(["note-folders"]);
       },
     );
-    // Task #454: dedicated event for permission-only flips on an
+    // dedicated event for permission-only flips on an
     // existing share (view ↔ edit). Same invalidation as `shared`,
     // but kept distinct so the contract is explicit and so future UI
     // can react with a toast like "Your access changed to Edit".