docs(checkpoint): restore echo fix live-verified at 01ce5de (2026-09-25)

CHECKPOINT-encryption.md

@@ -1,3 +1,35 @@
+# Checkpoint — restore secret-echo fix LIVE-VERIFIED (2026-09-25 late PM)
+
+## Where things are
+- Project: `/home/avi/Projects/Keynctr`
+- Branch: `master` @ **`01ce5de`** ("fix(nip46): restored sessions no
+  longer demand a connect secret re-echo"). Previous: `a809a67` (label
+  step), `5b13162` (Add-profile choice), `a6a4e6f` (flake kill).
+- SESSION RESTORE LIVE-VERIFIED against real Amber at 01ce5de: log shows
+  restoring session -> secret validation SKIPPED (restore) ->
+  get_public_key -> identity check PASS -> Connected, no scan. (Amber
+  answered a plain 'ack' here, not 'true' — the restore path now accepts
+  any ack shape and trusts the re-proved identity.)
+- Remaining live proof: one publish/note approved in Amber within the
+  120s leash (fresh pairing at 15:37 already exercised sign? — the
+  last_publish.json entry from 10:57 was BEFORE the fresh pairing; the
+  fresh profile has not published yet).
+
+## What was completed
+1. **Restore secret-echo fix (`01ce5de`)**: session restore failed 100%
+   against real Amber — the re-dial resent the pairing secret and the
+   client demanded an echo, but an already-approved signer legitimately
+   answers without re-echoing (echo = initial-pairing possession proof
+   only). ConnectUri gained a `restore` flag (only reactivate_saved_sessions
+   sets it): restore skips the echo and relies on expected_identity in
+   adopt_identity; fresh pairings still fail closed on a wrong echo.
+   e2f model updated: run_fake_amber now mirrors Amber ack shapes and
+   the restore test seeds a pairing secret (fails without the fix).
+   cargo test 216 unit + 5 e2e green; clippy 0; fmt clean; release
+   rebuilt at 01ce5de; backend restarted and LIVE restore verified.
+
+---
+
 # Checkpoint — signer pairing label step + vault prune (2026-09-25 PM)
 
 ## Where things are