docs: sync counts and regenerate pages for product team expansion

Update all documentation to reflect 177 skills, 254 tools, 357 references,
16 agents, and 17 commands. Add 4 new skill pages, 1 agent page, and
2 command pages to MkDocs site. Sync Codex (156) and Gemini (218) indexes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/commands/sprint-plan.md

@@ -0,0 +1,31 @@
+---
+title: "/sprint-plan"
+description: "/sprint-plan — Claude Code slash command."
+---
+
+# /sprint-plan
+
+<div class="page-meta" markdown>
+<span class="meta-badge">:material-console: Slash Command</span>
+<span class="meta-badge">:material-github: <a href="https://github.com/alirezarezvani/claude-skills/tree/main/commands/sprint-plan.md">Source</a></span>
+</div>
+
+
+Create a sprint plan with prioritized stories and capacity guardrails.
+
+## Usage
+
+```bash
+/sprint-plan <goal> [capacity]
+```
+
+## Output Structure
+
+- Sprint goal
+- Committed scope
+- Stretch scope
+- Risks and dependencies
+- Story-level acceptance criteria checks
+
+## Skill Reference
+- `product-team/agile-product-owner/SKILL.md`