feat: real release notes, restart button, reliable .run installer (0.0.10)

- feat(ci): set each Gitea release body from the matching CHANGELOG section
  (was hardcoded "Automated release for…")
- feat(updater): show "What's new" — release notes dialog before applying (GUI)
  and in `rigdoctor update` (CLI); fetch_latest/update_state now return notes
- feat(gui): "Restart now" button relaunches the app after an update is applied
- fix(packaging): build the self-extracting .run with a pure-Python extractor
  (packaging/make_run.py) instead of makeself, so it attaches to every release
  (it was silently skipped before)
- chore: adopt Conventional Commits + git-cliff (cliff.toml, packaging/
  changelog.sh) for changelog generation going forward (D20)
- chore(gui): drop internal module refs (M4, M5, …) from Setup descriptions

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

packaging/changelog.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env sh
+# Regenerate CHANGELOG.md from Conventional Commits using git-cliff (D20).
+# Install once:  pip install git-cliff   (ships prebuilt binaries)
+# Usage:         packaging/changelog.sh [--tag vX.Y.Z]
+set -eu
+
+ROOT=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+cd "$ROOT"
+
+command -v git-cliff >/dev/null 2>&1 || {
+    echo "git-cliff not found. Install it: pip install git-cliff"
+    exit 1
+}
+
+if [ "${1:-}" = "--tag" ] && [ -n "${2:-}" ]; then
+    git-cliff --tag "$2" -o CHANGELOG.md
+else
+    git-cliff -o CHANGELOG.md
+fi
+echo "Wrote CHANGELOG.md"