release(v1.7.5-alpha): OTA end-to-end test bump

Trivial version-only bump. No code changes; binary differs only in its
embedded CARGO_PKG_VERSION string. Frontend tarball is byte-identical
to v1.7.4-alpha's (same sha), copied under the new filename to satisfy
the manifest component naming.

This exists so the fleet nodes (.116/.198/.253), all now running
v1.7.4-alpha with the fixed apply_update tar flow, can exercise the
full OTA pipeline from the UI: Check → Download (30-min timeout) →
Install (sudo install binary + sudo tar to web-ui.new + atomic swap) →
auto-restart (systemctl --no-block) → sidebar updates → state sync.

Artefacts:
  archipelago                                      7422a695…a1a2a6  40362432
  archipelago-frontend-1.7.5-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 = "1.7.4-alpha"
+version = "1.7.5-alpha"
 dependencies = [
  "anyhow",
  "archipelago-container",

core/archipelago/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "archipelago"
-version = "1.7.4-alpha"
+version = "1.7.5-alpha"
 edition = "2021"
 description = "Archipelago Bitcoin Node OS - Native backend"
 authors = ["Archipelago Team"]

releases/manifest.json

@@ -1,24 +1,23 @@
 {
-  "version": "1.7.4-alpha",
+  "version": "1.7.5-alpha",
   "release_date": "2026-04-20",
   "changelog": [
-    "Install Update actually installs now. Before, the final step extracted the new UI into the wrong folder and bailed with 'Failed to apply update' — your node ended up backing up cleanly but never swapping in the new files. Fixed.",
-    "Download progress no longer overshoots 100%. You'll see the bar climb smoothly to 95% and then jump to 100% when the download actually finishes."
+    "Over-the-air update test — no feature changes, just a fresh version number so your node can walk through the whole update flow end-to-end: check, download, install, auto-restart. Safe to apply; nothing to do afterwards."
   ],
   "components": [
     {
       "name": "archipelago",
-      "current_version": "1.7.3-alpha",
-      "new_version": "1.7.4-alpha",
-      "download_url": "https://git.tx1138.com/lfg2025/archy/raw/branch/main/releases/v1.7.4-alpha/archipelago",
-      "sha256": "a14ad7e4dbcb8f74377d44a4bd5e600b285481df3b30c08f8bea2cd17e2a2be3",
-      "size_bytes": 40361984
+      "current_version": "1.7.4-alpha",
+      "new_version": "1.7.5-alpha",
+      "download_url": "https://git.tx1138.com/lfg2025/archy/raw/branch/main/releases/v1.7.5-alpha/archipelago",
+      "sha256": "7422a695c1c51e668657a817a96b2cba3a84607f505108ed29a35a17e0a1a2a6",
+      "size_bytes": 40362432
     },
     {
-      "name": "archipelago-frontend-1.7.4-alpha.tar.gz",
-      "current_version": "1.7.3-alpha",
-      "new_version": "1.7.4-alpha",
-      "download_url": "https://git.tx1138.com/lfg2025/archy/raw/branch/main/releases/v1.7.4-alpha/archipelago-frontend-1.7.4-alpha.tar.gz",
+      "name": "archipelago-frontend-1.7.5-alpha.tar.gz",
+      "current_version": "1.7.4-alpha",
+      "new_version": "1.7.5-alpha",
+      "download_url": "https://git.tx1138.com/lfg2025/archy/raw/branch/main/releases/v1.7.5-alpha/archipelago-frontend-1.7.5-alpha.tar.gz",
       "sha256": "4fb796643cc9dc8469078ca3392f7cc5541071f6849979922b3259e5f20172e9",
       "size_bytes": 76984615
     }