Add TODO.md

TODO.md

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+# Status
+
+pre-1.0
+
+# Next Step
+
+Implement the download retry policy from the README TODO: no retry on 4xx,
+exponential backoff on 5xx and network errors. Apply it to file and
+thumbnail downloads, cover it with mock-server tests, and update the
+README TODO checkbox.
+
+# Completed Steps
+
+- 2026-06-10: Decrypted collections shared by other users (sealed-box
+  keys); listCollections drops deleted-collection tombstones.
+- 2026-06-10: Login hardening: dual-2FA empty-string fields handled, TOTP
+  preferred when a passkey is also enrolled, interactive input via
+  @inquirer/prompts.
+- 2026-06-10: Replaced sharp with pure JS (jpeg-js + exif-reader); added
+  single-binary bun build and make install.
+- 2026-06-09: Added backup-metadata command (ML data always included,
+  --exif opt-in); rewrote README to match the implementation; added
+  thumbnail helper tests.
+- 2026-05-13: Full CLI surface: login, backup with dedup symlink layout,
+  collections, files, get, get-thumb, thumbnail repair helpers.
+- 2026-05-13: Client OO API with literate usage tests; file download and
+  decryption; all three metadata layers decrypted and persisted; renamed
+  quack to quak.
+- 2026-05-11: SRP login flow (email OTP + TOTP) and ApiClient.
+
+# Future Steps
+
+- Retry policy: no retry on 4xx, exponential backoff on 5xx and network
+  errors (the Next Step).
+- Update the README API reference section to match the current
+  implementation.
+- Make `make docker` green.
+- Tag v1.0.0.
+- Future desktop client, separate repo:
+    - Electron app skeleton consuming this library.
+    - Local SQLite cache keyed on (collectionID, fileID, updationTime).
+    - Background sync worker streaming new files into the cache.
+    - Gallery UI: thumbnails, full-image view, basic search.
+    - Upload, delete, and share operations in the library.