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

lib/db/src/built-in-apps.ts

@@ -9,7 +9,7 @@
 //      in the SPA today. Locking them keeps the seeded path stable so
 //      links, deep-links, audits, and future hardcoded routes stay in
 //      sync with the seed contract.
-// Task #517: server rejects route AND slug changes for these slugs and
+// server rejects route AND slug changes for these slugs and
 // the admin form locks both fields. Add a slug here whenever you wire
 // a new hardcoded <Route> in App.tsx OR seed a new canonical app.
 //

lib/db/src/schema/notes.ts

@@ -122,7 +122,7 @@ export type NoteReply = typeof noteRepliesTable.$inferSelect;
  * always see the owner's current notes via a join, so adds/edits/removes by the
  * owner are reflected live in the recipient's "Shared with me" view.
  *
- * Permission per recipient (Task #454): "view" (default, read-only) or
+ * Permission per recipient: "view" (default, read-only) or
  * "edit" (full create/update/delete on the owner's notes inside this folder).
  * Notes mutated by an editor still belong to the folder owner — the folder
  * stays a single namespace under `noteFoldersTable.userId`.