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phase 6: web storage layer (KeyStore, Cache, session)

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KeyStore + Cache TS interfaces with WebCrypto non-extractable Ed25519
keys persisted via IndexedDB (idb), plus thin api/session.ts that
loads or creates the device session at app startup. Vitest unit
tests under fake-indexeddb cover both adapters; Playwright e2e
verifies the keypair survives reload and produces signatures still
verifiable under the persisted public key (gateway round-trip moves
to Phase 7's existing acceptance bullet).

Browser baseline: WebCrypto Ed25519 — Chrome >=137, Firefox >=130,
Safari >=17.4. No JS fallback; ui/docs/storage.md documents the
matrix and the WebKit non-determinism quirk.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Ilia Denisov
2026-05-07 14:08:09 +02:00
parent 87a6694e2d
commit ecd2bc9348
18 changed files with 1133 additions and 29 deletions
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docs/ARCHITECTURE.md
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@@ -572,7 +572,9 @@ and revoke metadata.
the device.
- Browser/WASM clients use WebCrypto with non-exportable storage where
available. Loss of browser storage is acceptable and is recovered by
re-login.
re-login. The concrete browser baseline, IndexedDB schema, and
keystore lifecycle live in
[`ui/docs/storage.md`](../ui/docs/storage.md).
### Request envelope