What: Add a GSTACK_AUTO_UPGRADE=1 env var or ~/.gstack/config option that skips the AskUserQuestion prompt and upgrades automatically when a new version is detected.
Why: Power users and CI environments may want zero-friction upgrades without being asked every time.
Context: The current upgrade system (v0.3.4) always prompts via AskUserQuestion. This TODO adds an opt-in bypass. Implementation is ~10 lines in the preamble instructions: check for the env var/config before calling AskUserQuestion, and if set, go straight to the upgrade flow. Depends on the full upgrade system being stable first — wait for user feedback on the prompt-based flow before adding this.
Effort: S (small) Priority: P3 (nice-to-have, revisit after adoption data)
What: Convert ship/, review/, plan-ceo-review/, plan-eng-review/, retro/ SKILL.md files to .tmpl templates using the {{UPDATE_CHECK}} placeholder.
Why: These 5 skills still have the update check preamble copy-pasted. When the preamble changes (like the || true fix in v0.3.5), all 5 need manual updates. The {{UPDATE_CHECK}} resolver already exists in scripts/gen-skill-docs.ts — these skills just need to be converted.
Context: The browse-using skills (SKILL.md, browse/, qa/, setup-browser-cookies/) were converted to .tmpl in v0.3.5. The remaining 5 skills only use {{UPDATE_CHECK}} (no {{BROWSE_SETUP}}), so the conversion is mechanical: replace the preamble with {{UPDATE_CHECK}}, add the path to findTemplates() in scripts/gen-skill-docs.ts, and commit both .tmpl + generated .md.
Depends on: v0.3.5 shipping first (the {{UPDATE_CHECK}} resolver).
Effort: S (small, ~20 min)
Priority: P2 (prevents drift on next preamble change)