feat: passphrase change and account recovery (auth-confirm)

The passphrase derives two independent client-side values: auth_key (the
hub verifier) and bundle_key (AES-GCM key for the per-node identity
bundles, which live on nodes and never on the hub). Changing or
recovering a passphrase is therefore two operations — swap the hub
verifier, and re-wrap every reachable node's identity bundle.

Flow A — change a known passphrase (Profile page)
- POST /v1/users/password re-proves the current passphrase, swaps
  pw_hash/salt/version, revokes every refresh token and returns a fresh
  pair so the tab that made the change stays signed in.
- MeshBayTransport.rewrapAllNodes: for every group's online node, connect
  with the old key, read the identity off the handshake, store it back
  under the new key. Returns updated / unreachable / failed so the UI can
  point at the operator-unpin fallback for the gaps. Always-shown
  confirmation dialog listing reachable and unreachable groups.

Recovery key
- keyderive.js generateRecoveryKey (32 random bytes, grouped Base32) and
  deriveRecoveryKey (HKDF-SHA256, domain meshbay:recovery:v1:<username>).
- Every per-node identity gets a second copy wrapped under the recovery
  key: keypair_bundles.bundle_enc_recovery (node-only column, added in
  _SCHEMA_KEYPAIR and via a PRAGMA-guarded ALTER for existing DBs),
  carried on keypair_bundle_store / _resp. MNP 0.13 -> 0.14, additive.
- session.recoveryKey is persisted in IndexedDB (slot rk) and lazy-loaded
  on connect, so a group joined in any later session still leaves a
  recovery copy.
- Shown once at registration; optionally folded into the verification
  e-mail as a pass-through the hub never stores or logs, with an opt-out.
- Profile -> Recovery key re-loads R and backfills every reachable node
  via rewrapAllNodes in bundleKey mode (no passphrase re-entry).

Flow B — recover a lost passphrase (#/reset, linked from sign-in)
- POST /v1/users/password/reset-request {username, email}: both must be
  the pair on file, checked against the blind email_hash (never
  decrypted). A mismatch — wrong e-mail, unknown username, non-active
  account — takes the identical no-op path (no code, no mail, same 200),
  so it reveals nothing and cannot be used to spray reset mail from a
  username alone. 5/min, 1-hour single-use code.
- POST /v1/users/password/reset {username, code, new_auth_key}: same
  expiry / attempts / single-use checks as e-mail verification; revokes
  every session and deletes every registered device key so a stored one
  cannot sign back in past the reset.
- ResetPasswordPage: request code -> code + optional recovery key + new
  passphrase -> reset + sign-in -> fan-out. connect() falls back to the
  recovery-wrapped copy when the passphrase key cannot open bundle_enc.
  Without a recovery key: sign-in is restored and each group needs the
  operator-unpin fallback.

Supporting fixes (found in live testing)
- member unpin now also deletes the keypair bundle; connect() mints a
  fresh identity when handed a bundle it cannot open (unless _rewrapOnly,
  set by rewrapAllNodes), so a rejoin completes instead of dead-ending
  before the invite-code prompt.
- A browser with no bundle key gets a passphrase prompt on the group page
  instead of a "go back to the browser you registered on" message.
- RegisterPage / LoginPage / ResetPasswordPage trim the username so every
  key derivation matches the hub's stored form.

Docs: docs/auth-confirm.md. Locale keys across all ten catalogues.
Tests: test_password_change, test_password_reset, test_recovery_email,
test_recovery_key, test_rewrap_fanout, test_bundle_store_recovery, plus
additions to test_admin_ops_mnp and test_webrtc_transport. Hub suite 492
passed; node suite 741 passed (the lone test_packaging_units failure is a
pre-existing RPM-spec flake, reproducible on main).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GGkxJW9br8Y9bhT8ywJ3oc

1 files changed, 76 insertions, 0 deletions

diff --git a/packages/meshbay-node/tests/test_bundle_store_recovery.py b/packages/meshbay-node/tests/test_bundle_store_recovery.py
new file mode 100644
index 0000000..10a3400
--- /dev/null
+++ b/packages/meshbay-node/tests/test_bundle_store_recovery.py
@@ -0,0 +1,76 @@
+"""
+The recovery-wrapped keypair copy (docs/auth-confirm.md §4.3, MNP 0.14).
+
+`bundle_enc_recovery` is a second copy of the identity bundle wrapped under the
+account's recovery key. The store has to add the column to a database that
+predates it, and a plain re-backup that omits the recovery copy must not erase
+one already there.
+"""
+
+import aiosqlite
+import pytest
+from meshbay_node.bundle_store import BundleStore
+
+
+@pytest.mark.asyncio
+async def test_round_trip_with_and_without_recovery(tmp_path):
+    store = BundleStore(db_path=tmp_path / "bundles.db")
+    await store.open()
+
+    await store.store_keypair("u1", "pass-wrapped-1")
+    row = await store.fetch_keypair("u1")
+    assert row == {"bundle_enc": "pass-wrapped-1", "bundle_enc_recovery": None}
+
+    await store.store_keypair("u2", "pass-wrapped-2", "recovery-wrapped-2")
+    row = await store.fetch_keypair("u2")
+    assert row["bundle_enc"] == "pass-wrapped-2"
+    assert row["bundle_enc_recovery"] == "recovery-wrapped-2"
+
+    assert await store.fetch_keypair("nobody") is None
+    await store.close()
+
+
+@pytest.mark.asyncio
+async def test_re_backup_without_recovery_keeps_the_existing_copy(tmp_path):
+    """A passphrase-change re-wrap sends only bundle_enc; the recovery copy stays."""
+    store = BundleStore(db_path=tmp_path / "bundles.db")
+    await store.open()
+
+    await store.store_keypair("u1", "v1", "recovery-v1")
+    await store.store_keypair("u1", "v2")                       # no recovery arg
+    row = await store.fetch_keypair("u1")
+    assert row["bundle_enc"] == "v2"
+    assert row["bundle_enc_recovery"] == "recovery-v1"
+
+    # An explicit new recovery copy does replace it.
+    await store.store_keypair("u1", "v3", "recovery-v3")
+    row = await store.fetch_keypair("u1")
+    assert row == {"bundle_enc": "v3", "bundle_enc_recovery": "recovery-v3"}
+    await store.close()
+
+
+@pytest.mark.asyncio
+async def test_migration_adds_the_column_to_an_old_database(tmp_path):
+    db_path = tmp_path / "bundles.db"
+
+    # A keypair_bundles table as it looked before MNP 0.14.
+    async with aiosqlite.connect(str(db_path)) as db:
+        await db.execute(
+            "CREATE TABLE keypair_bundles ("
+            "  user_id TEXT PRIMARY KEY,"
+            "  bundle_enc TEXT NOT NULL,"
+            "  stored_at TEXT NOT NULL DEFAULT (datetime('now')))")
+        await db.execute(
+            "INSERT INTO keypair_bundles (user_id, bundle_enc) VALUES ('old', 'legacy')")
+        await db.commit()
+
+    store = BundleStore(db_path=db_path)
+    await store.open()   # runs the migration
+
+    row = await store.fetch_keypair("old")
+    assert row == {"bundle_enc": "legacy", "bundle_enc_recovery": None}
+
+    await store.store_keypair("old", "legacy", "recovery-now")
+    row = await store.fetch_keypair("old")
+    assert row["bundle_enc_recovery"] == "recovery-now"
+    await store.close()