ci: add Tessl skill-review-and-optimize workflow with /apply-optimize

[popey]

Hey @thymikee 👋

Following up on the skill improvements PR that was merged — this adds a GitHub Action that automatically reviews and optimizes SKILL.md files on future PRs, so your skills stay aligned with best practices as they evolve without manual effort.

What this adds

.github/workflows/skill-review.yml — runs on every PR that touches a SKILL.md:

• Posts Tessl scores + AI-suggested improved skill content as a single PR comment
• Uses tesslio/skill-review-and-optimize

.github/workflows/skill-optimize-apply.yml — triggered by a /apply-optimize comment on a PR:

• Commits the AI-suggested improvements directly to the PR branch — no copy-paste needed

🔑 One-time setup required

Add a TESSL_API_TOKEN secret to this repo:
Settings → Secrets and variables → Actions → New repository secret

Get a free token at https://tessl.io/account/api-keys.

Without the token the action still posts review scores and feedback — just without the AI optimization suggestions.

What stays the same

• Non-blocking by default — no red CI unless you add fail-threshold
• Only fires on **/SKILL.md PRs — no noise on other changes
• Contributors need no Tessl account — only the repo owner needs the API token for optimization

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Honest disclosure — I work at @tesslio where we build tooling around skills like these. Not a pitch — just saw room for improvement and wanted to contribute.

Want to self-improve your skills? Just point your agent (Claude Code, Codex, etc.) at this Tessl guide and ask it to optimize your skill. Ping me — @popey — if you hit any snags.

Thanks in advance 🙏