feat(tui+release): persist vitest memory guard, aggregate root CHANGELOG, lockstep all packages

TUI: vitest memory-guard threshold and on/off toggle now persist to
global settings (vitestAutoKillEnabled / vitestKillThresholdPct), so
they survive dashboard restarts. Stats panel shows the system-memory
used percentage next to used/free. Utilities panel exposes [+/-] to
adjust the threshold in 5% steps (50–99%).

Release: scripts/release.mjs auto-syncs a root CHANGELOG.md aggregated
from every packages/*/CHANGELOG.md, grouped by version with one
sub-block per package.

Versioning: all private @fusion/* packages joined the changesets fixed
group with the public cli + cli-alias and were aligned to 0.2.5, so
every release bumps every package and produces per-package CHANGELOG
entries that the aggregator picks up.

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

packages/desktop/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@fusion/desktop",
-  "version": "0.1.0",
+  "version": "0.2.5",
   "license": "MIT",
   "description": "Fusion desktop: Electron wrapper around the Fusion dashboard for macOS, Windows, and Linux.",
   "homepage": "https://github.com/Runfusion/Fusion#readme",