Release 0.0.7: user-local installer + self-update apply

- install.sh: no-root user-local install (private venv + ~/.local/bin launchers
  + desktop entry); --ref <tag> to install a specific release, --uninstall to
  remove; auto-installs the python3-venv prerequisite with consent
- packaging/make-run.sh: build a self-extracting .run installer (makeself)
  bundling the wheel + install.sh; release workflow builds and attaches it
- M13 self-update apply: `rigdoctor update` runs an authenticated pip upgrade
  (rigdoctor[gui] @ git+https://oauth2:<token>@...@<tag>), token scrubbed; GUI
  sidebar "Update to v…" button applies it and prompts to restart
- version 0.0.7, CHANGELOG, docs (M9/M13, ROADMAP, README install section)

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

.gitea/workflows/release.yml

@@ -27,6 +27,11 @@ jobs:
           python -m pip install --upgrade build
           python -m build
 
+      - name: Build self-extracting installer (.run)
+        run: |
+          (apt-get update && apt-get install -y makeself && sh packaging/make-run.sh) \
+            || echo "makeself unavailable — skipping .run"
+
       - name: Read version
         id: ver
         run: |