Codex skill for development added. Tested by using it to set up Play Palace.

.codex/skills/linux-game-manager-dev/references/skill-maintenance.md

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+# Skill Maintenance (Critical)
+
+This skill is only trustworthy if it is refreshed immediately after behavior changes.
+
+## Mandatory Refresh Triggers
+
+Run this maintenance workflow whenever any of these change:
+
+- `linux-game-manager.sh`
+- Anything in `.install/`
+- Anything in `.launch/`
+- Anything in `.update/`
+- Anything in `speech/`
+- `README.md`
+- Any game lifecycle contract (install path usage, symlink behavior, update function contracts, CLI flags)
+
+## Refresh Workflow
+
+1. Run catalog audit and capture output:
+
+```bash
+python3 .codex/skills/linux-game-manager-dev/scripts/audit_game_catalog.py
+```
+
+2. Re-check core flow definitions in `linux-game-manager.sh`:
+
+```bash
+rg -n "game_installer|game_launcher|game_removal|game_update|getopts|help\\(" linux-game-manager.sh
+```
+
+3. Update skill references:
+- Update `references/core-map.md` catalog snapshot if counts changed.
+- Update `references/core-map.md` flow descriptions if behavior changed.
+- Update `references/game-extension.md` if onboarding or naming rules changed.
+- Update this file if refresh triggers or process changed.
+
+4. Validate the skill structure:
+
+```bash
+python3 /home/storm/.codex/skills/.system/skill-creator/scripts/quick_validate.py .codex/skills/linux-game-manager-dev
+```
+
+5. If any bash scripts changed, run shellcheck on edited files and fix all errors.
+   - If `shellcheck` is missing, pause and prompt the user to install it using `references/tooling-prereqs.md`.
+
+## Completion Criteria
+
+Do not consider maintenance complete until all are true:
+
+1. Catalog audit shows no critical mismatches, and any warnings are reviewed.
+2. All changed behavior is reflected in skill reference files.
+3. Skill passes `quick_validate.py`.
+4. Any edited bash scripts are shellcheck-clean.