fix(app): turn the APK download back on for v0.7.0

platform.json's androidApk.serviceable goes to true. It was false because
v0.5.0's build did not work. v0.7.0's released APK (SHA256 matches
SHA256SUMS) was installed on an Android 16 emulator, connected to the
public demo and read its Rust servers, so /app/ links the download again.

The comment beside the flag now says when it was last checked and to set
it back to false when `asset` moves to a release nobody has run. PLAN.md
D29 gets a dated note.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

src/data/platform.json

@@ -120,17 +120,18 @@
     "",
     "`serviceable` is the one value here with no authority to check it against, and it is",
     "deliberately manual. It answers a question no API can: does the published build",
-    "actually work. The org lead reports v0.5.0's does not, so the download block renders a",
-    "'being replaced' state instead of a link, and flipping this to true is the single edit",
-    "that turns the link back on once a working build is released. A check cannot run an",
-    "APK; a person can, and this is where they record that they did."
+    "actually work. v0.5.0's did not, and while false the download block renders a 'being",
+    "replaced' state instead of a link. A check cannot run an APK; a person can, and this",
+    "is where they record that they did. v0.7.0's was installed on an Android 16 emulator",
+    "on 2026-10-31, connected to the public demo and read its Rust servers: true.",
+    "When `asset` moves to a new release, set this back to false until someone has run it."
   ],
   "androidApk": {
     "asset": "runic-gateway-0.7.0.apk",
     "checksums": "SHA256SUMS",
     "minSdk": 29,
     "minAndroid": "10",
-    "serviceable": false
+    "serviceable": true
   },
 
   "gitea": {