Release Preview 20 shared desktop, Android and Sargo updates

Restore Gaia settings and media workflows, extend native network adapters, and align the APK payload. Generate French/English changelogs and website entries from the simplified JSON source.

Validation: shared JS and Tundra unit tests; desktop workflows and persistence; signed APK payload parity; Sargo RAM and installed startup with boot readback. Android runtime qualification is recorded separately.

tundra/runtime/mms-codec.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Build the separate GPL-3.0 Nuntium codec helper from locked Go modules."""
+import hashlib,json,os,shutil,subprocess
+from pathlib import Path
+
+
+def stage(root):
+    project=Path(__file__).resolve().parents[2]
+    source=project/'tundra/mms-codec'
+    out=project/'tundra/out/mms-codec-build';out.mkdir(parents=True,exist_ok=True)
+    binary=out/'tundra-mms-codec'
+    env={**os.environ,'GOMODCACHE':str(project/'tundra/downloads/go-modules'),
+         'GOCACHE':str(project/'tundra/out/go-cache'),'GOOS':'linux','GOARCH':'arm64','CGO_ENABLED':'0'}
+    subprocess.run(['go','build','-mod=readonly','-trimpath','-ldflags=-s -w','-buildvcs=false','-o',str(binary),'.'],cwd=source,env=env,check=True)
+    target=root/'usr/libexec/tundra-mms-codec';target.parent.mkdir(parents=True,exist_ok=True);shutil.copy2(binary,target)
+    doc=root/'usr/share/doc/tundra-mms-codec';doc.mkdir(parents=True,exist_ok=True)
+    for name in ['main.go','go.mod','go.sum','COPYING']:shutil.copy2(source/name,doc/name)
+    (doc/'provenance.json').write_text(json.dumps({'license':'GPL-3.0-only',
+      'source':'https://gitlab.com/ubports/development/core/nuntium',
+      'revision':'d051757417a42872abb99c7583a8a4af6e3108f5',
+      'sha256':hashlib.sha256(binary.read_bytes()).hexdigest()},indent=2)+'\n')
+    return target