Add sprint plan skill

skills/sprint/plan.md

@@ -0,0 +1,50 @@
+# Skill: Sprint Plan
+
+## Description
+AI-assisted sprint planning that analyzes backlog and suggests sprint contents.
+
+## Input
+- **project**: Project name (required)
+- **sprint_length**: Sprint length in days (optional, default: 14)
+- **team_capacity**: Team story points capacity (optional)
+- **priorities**: Priority focus areas (optional)
+
+## Steps
+1. Fetch open issues from Gitea
+2. Analyze issue complexity and dependencies
+3. Estimate story points using historical data
+4. Suggest sprint contents based on capacity
+5. Create sprint milestone
+
+## Output Format
+```json
+{
+  "status": "success|error",
+  "sprint": {
+    "name": "Sprint 12",
+    "start_date": "2024-12-11",
+    "end_date": "2024-12-25",
+    "total_points": 21,
+    "issues": [
+      {
+        "id": 42,
+        "title": "Issue title",
+        "points": 3,
+        "priority": "high",
+        "assignee": "developer"
+      }
+    ]
+  },
+  "recommendations": [
+    "Consider splitting issue #45 - complexity too high",
+    "Add buffer for bug fixes"
+  ]
+}
+```
+
+## Token Budget
+- Max input: 2000 tokens
+- Max output: 1000 tokens
+
+## Model
+- Recommended: sonnet (analysis and estimation)