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/prd.md

@@ -0,0 +1,31 @@
+---
+title: "/prd"
+description: "/prd — Claude Code slash command."
+---
+
+# /prd
+
+<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/prd.md">Source</a></span>
+</div>
+
+
+Generate a concise product requirements document for a feature, initiative, or problem statement.
+
+## Usage
+
+```bash
+/prd <feature-or-problem>
+```
+
+## Output Structure
+
+- Problem statement
+- Goals and non-goals
+- User stories and acceptance criteria
+- Metrics and success thresholds
+- Scope and timeline assumptions
+
+## Skill Reference
+- `product-team/product-manager-toolkit/SKILL.md`