chore: remove all source code comments and internal artifacts

Strip every comment from the source (parsed with the TypeScript compiler so
strings, template literals, regex literals and JSX are never touched), and drop
internal/working artifacts that do not belong in the public repository
(design mockups, internal analysis docs, a stray backup file and an old log).
No functional change: build is green, the full test suite passes.

tests/session-restart-loss.test.ts

@@ -12,12 +12,6 @@ import {
   saveSessionAsync
 } from "../src/main/storage";
 
-// Regression tests for queue loss across an app-update restart.
-// Both scenarios were observed empirically to drop packages before the fix:
-//   - a queued stale async save clobbering a newer synchronous save
-//     (persistNowSync / prepareForShutdown), and
-//   - loadSession ignoring a good .bak when the primary file is momentarily absent.
-
 const tempDirs: string[] = [];
 
 afterEach(() => {
@@ -66,7 +60,6 @@ function makeItem(id: string, packageId: string): DownloadItem {
   };
 }
 
-/** Build a session whose package set is exactly `ids`. */
 function sessionWith(ids: string[]): SessionState {
   const s = emptySession();
   for (const id of ids) {
@@ -91,8 +84,6 @@ describe("session restart loss", () => {
 
     saveSession(paths, sessionWith(["A", "B"]));
 
-    // An async save goes in-flight, a second async save (stale snapshot) gets
-    // queued, then a synchronous save persists the live state with package C.
     const inflight = saveSessionAsync(paths, sessionWith(["A", "B"]));
     const queued = saveSessionAsync(paths, sessionWith(["A", "B"]));
     saveSession(paths, sessionWith(["A", "B", "C"]));