checkpoint: docs honesty fix at d4d87b8 (2026-09-22)

CHECKPOINT-encryption.md

@@ -1,3 +1,57 @@
+# Checkpoint — 'keys never leave' claim corrected per-mode (2026-09-22); prior: pairing forensics de-noised
+
+## Where things are
+- Project: `/home/avi/Projects/Keynctr`
+- Branch: `master` @ **`d4d87b8`** ("docs: replace blanket 'keys never leave
+  the machine' claim with per-mode truth"). Previous: `f6bf6a9`, `edd4e56`
+  (pairing feature HEAD), `deeb4f9`, `d52fa58`.
+- Working tree: clean for tracked files. Untracked intentionally NOT
+  committed: `COSMIC_THEME.md`, `KeynectrAppIconPossibility02.jpeg`,
+  `deferred/` (stays deferred).
+- Release binary: still built at `f6bf6a9` — `d4d87b8` changed only
+  Markdown docs, no rebuild needed.
+- Verification at `d4d87b8`: `cargo fmt --check` clean, `cargo test` **208
+  unit + 3 e2e passed / 0 failed** (first run showed 1 e2e flake; both the
+  targeted `cargo test --test nip46_e2e` rerun and the full rerun were
+  green). No frontend changes (npm suite last green at `edd4e56`).
+
+## What was completed since the last checkpoint
+- **Honest security copy (`d4d87b8`)**: the blanket "keys never leave the
+  machine" claim in README.md (tagline), PRODUCT.md (purpose, positioning,
+  principle 1), and DESIGN.md (North Star) was replaced with the per-mode
+  truth: in embedded/bunker modes keys stay in the local encrypted vault
+  and never reach the renderer; in external NIP-46 signer mode the key
+  never *arrives* on this machine — a strictly stronger posture against
+  desktop compromise. README security notes gained an explicit bullet
+  saying external signer mode can be *more* secure. App UI
+  (`SignerModeScreen.tsx`) already ranked external signer "Most Secure /
+  Private key NEVER on this device" — no code or test changes were needed.
+
+## Commits added (newest first)
+- `d4d87b8` docs: replace blanket 'keys never leave the machine' claim with per-mode truth
+
+## How to reproduce / exercise
+- **LIVE AMBER TEST (still the only missing step from `f6bf6a9`)**: launch
+  the app: `cd frontend && npx vite --port 5173` then
+  `NOSTR_GUI_DEV_URL=http://localhost:5173 KEYNCTR_ENABLE_GPU=1 npx electron .`
+  Signer mode -> Show QR -> scan in Amber -> approve. Expected trace:
+  `pairing started: ephemeral=…` -> `inbound 24133 from …` -> `connect
+  response accepted (secret echo verified)` -> `paired: connection stored;
+  handing over to identity handshake` -> `identity adopted: npub=… —
+  CONNECTED`. Watch with `bash ~/Tools/keynctr-debug/watch-pairing.sh 240`.
+- Docs-only change: `git show d4d87b8`.
+
+## Outstanding / next steps
+1. **Live Amber re-scan required** (cannot be done from an unattended run).
+2. If trace shows `pre-handshake 'get_public_key' ignored`, relax the
+   connect-only gate.
+3. `publish_profile_metadata` (kind 0) still signs locally — reroute
+   through `Signing` for external profiles (P2).
+4. Step 5 (KDF upgrade), Step 6 (undo preserves ProfileSummary), Step 7
+   (rename pass incl. `homepage` URL).
+
+---
+
 # Checkpoint — pairing forensics fully de-noised; Amber fix still awaiting live test (2026-09-21)
 
 ## Where things are