docs(skills): add create-issue skill for filing GitHub issues (#797)

Add a simple agent skill that documents how to gather context, check
for duplicates, and file bug reports via gh issue create.

skills/create-issue/SKILL.md

@@ -0,0 +1,94 @@
+---
+name: create-issue
+description: File a GitHub issue in classroomio/classroomio. Use when the user asks to create, file, or open a bug ticket or issue.
+---
+
+Follow these steps in order. Keep the issue short and actionable.
+
+## 1. Understand the report
+
+Confirm before filing:
+
+- **What** is broken or requested
+- **Where** in the product (exact screen/flow — e.g. org landing page editor → Embed, not course builder)
+- **Steps to reproduce** (numbered, from a known starting state)
+- **Expected** vs **actual** behavior
+- **Evidence** — screen recording, screenshot, or error message (link if available)
+
+If the user shared a video, fetch the transcript or summary first.
+
+## 2. Check for duplicates
+
+```bash
+gh issue list --repo classroomio/classroomio --state all --limit 30 --search '<keywords>' --json number,title,state,url
+```
+
+Do not file if an open issue already covers the same bug.
+
+## 3. Pick issue type
+
+| Type | When | Label |
+|------|------|-------|
+| Bug | Something broken or data lost | `bug` |
+| Feature | New capability | use feature template fields |
+| Improvement | Small enhancement | use improvement template fields |
+
+Most agent-filed reports are **bugs**. Use the bug report fields from `.github/ISSUE_TEMPLATE/bug-report.yml`.
+
+**Title format:** `[area] Short description`  
+Examples: `[org landing page] Embed code textarea overflows sidebar`
+
+**Severity (bugs):**
+
+- S0 — data loss, security, crash, payments
+- S1 — core feature broken, no workaround
+- S2 — wrong behavior, workaround exists
+- S3 — cosmetic / layout only
+
+## 4. Create the issue
+
+```bash
+gh issue create --repo classroomio/classroomio \
+  --title "[area] Short description" \
+  --label "bug" \
+  --body "$(cat <<'EOF'
+## Bug Report
+
+### Severity
+S2 — Minor (works but wrong/confusing; workaround exists)
+
+### Area
+organizations / settings
+
+### Environment
+Not yet verified
+
+### Steps to reproduce
+1. ...
+
+### Expected behavior
+...
+
+### Actual behavior
+...
+
+### Screen recording
+(link if available)
+
+### Likely cause
+(optional — file path + one-line explanation if you found it in the codebase)
+
+### Mode-specific?
+No — happens in both / not mode-related
+
+### Before filing
+- [x] I searched existing issues and this is not a duplicate.
+EOF
+)"
+```
+
+Fill in every section. Remove optional sections you cannot support. Link related issues with `#123`.
+
+## 5. Reply to the user
+
+Return the issue URL and a one-line summary. Do not open a PR unless asked.