release(v1.7.7-alpha): clean OTA test bump on top of robust apply

Pure version bump. No code changes. First release shipped with the
reinforced apply_update (timestamped staging + all-mv) and frontend
with 95% progress cap — this OTA should walk through cleanly from
.116/.198/.253 without any sideload intervention.

Artefacts:
  archipelago                                      e3f1740d…006025  40373392
  archipelago-frontend-1.7.7-alpha.tar.gz          4fb79664…0172e9  76984615 (reused)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/Cargo.lock

@@ -80,7 +80,7 @@ checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
 
 [[package]]
 name = "archipelago"
-version = "1.7.6-alpha"
+version = "1.7.7-alpha"
 dependencies = [
  "anyhow",
  "archipelago-container",

core/archipelago/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "archipelago"
-version = "1.7.6-alpha"
+version = "1.7.7-alpha"
 edition = "2021"
 description = "Archipelago Bitcoin Node OS - Native backend"
 authors = ["Archipelago Team"]