chore: add pull request template for skill submissions

.github/pull_request_template.md

@@ -0,0 +1,43 @@
+## What changed
+
+<!-- Briefly describe what skill(s) were added, updated, or removed. -->
+
+## Why
+
+<!-- What gap does this fill, or what problem does it solve? -->
+
+## Notes
+
+<!-- Anything reviewers should know — testing approach, follow-ups, open questions. -->
+
+---
+
+# Skills
+
+## Checklist
+
+**Naming**
+- [ ] Name uses gerund form — first word ends in `-ing` (e.g. `generating-apex-tests`)
+
+**Description quality**
+- [ ] Describes what the skill does and the expected output
+- [ ] Includes relevant Salesforce domain keywords (Apex, LWC, SOQL, metadata types, etc.)
+- [ ] Trigger phrases are specific enough for Vibes to select this skill reliably
+
+**Instructions**
+- [ ] Clear goal statement
+- [ ] Step-by-step workflow
+- [ ] Validation rules for generated output
+- [ ] Defined output / artifact
+
+**Context efficiency**
+- [ ] Core instructions are concise — supporting material lives in `templates/`, `examples/`, or `docs/` subdirectories
+- [ ] No unnecessary background explanation in the body
+
+---
+
+**Automated checks** — enforced by CI (`npm run validate:skills`):
+
+- Directory is one level deep, named in kebab-case, contains `SKILL.md`
+- Frontmatter `name` matches directory name; `description` is present, ≥ 20 words, and includes trigger language
+- Body is non-empty and under 500 lines