/collections/v2 is a sync API: deleted collections remain in the
response forever with isDeleted: true, and their /collections/v2/diff
endpoint returns HTTP 404. A long-lived account accumulates hundreds
of tombstones, so any caller that iterates listCollections() output
(backup, backup-metadata) dies on the first one.
Collections shared with the account are not encrypted with the master
key: the sharer only knows the recipient's public key, so the server
delivers encryptedKey as crypto_box_seal to that key and omits
keyDecryptionNonce entirely. decryptCollection assumed the owned-only
wire format and crashed on fromBase64(undefined) for any account with
an incoming shared album, taking down listCollections and every
command built on it (backup, backup-metadata, ...).
The previous "shared" fixture was unfaithful (secretbox + nonce with a
foreign ownerID, a shape the server never sends), which is why the
suite stayed green. These tests model the real wire format and change
decryptCollection to take the full key material {masterKey, publicKey,
secretKey} so it can unseal shared collection keys.
German for 'quack', matching the Ente (German for 'duck') naming. All
references updated: package name, CLI binary, X-Client-Package header,
test descriptions, temp dir prefixes, README, Makefile docker tag.
test/client/usage.test.ts is a tutorial-as-test-suite that walks
through the entire quack API in order: login, whoami, listCollections,
listFiles, downloadFile, downloadThumbnail, toJSON/fromJSON, logout.
Each it() block is a self-contained example with prose commentary
explaining what the code does and why, with code samples showing the
API as a consumer would use it. The mock server performs real SRP and
crypto so the test data is structurally identical to production.
8 tests, all failing against the stub.
