docs: update all documentation with accurate counts and regenerated skill pages

- Update skill count to 170, Python tools to 213, references to 314 across all docs
- Regenerate all 170 skill doc pages from latest SKILL.md sources
- Update CLAUDE.md with v2.1.1 highlights, accurate architecture tree, and roadmap
- Update README.md badges and overview table
- Update marketplace.json metadata description and version
- Update mkdocs.yml, index.md, getting-started.md with correct numbers

docs/skills/engineering/codebase-onboarding.md

@@ -10,6 +10,8 @@ description: "Codebase Onboarding - Claude Code skill from the Engineering - POW
 ---
 
 
+# Codebase Onboarding
+
 **Tier:** POWERFUL  
 **Category:** Engineering  
 **Domain:** Documentation / Developer Experience  
@@ -272,7 +274,7 @@ await sendEmail({
   to: user.email,
   subject: 'Subject line',
   template: 'my-email',
-  props: { name: user.name },
+  props: { name: "username"
 })
 ```
 
@@ -447,44 +449,7 @@ pnpm validate
 ---
 
 ## Output Formats
-
-### Notion Export
-
-```javascript
-// Use Notion API to create onboarding page
-const { Client } = require('@notionhq/client')
-const notion = new Client({ auth: process.env.NOTION_TOKEN })
-
-const blocks = markdownToNotionBlocks(onboardingMarkdown) // use notion-to-md
-await notion.pages.create({
-  parent: { page_id: ONBOARDING_PARENT_PAGE_ID },
-  properties: { title: { title: [{ text: { content: 'Engineer Onboarding — MyApp' } }] } },
-  children: blocks,
-})
-```
-
-### Confluence Export
-
-```bash
-# Using confluence-cli or REST API
-curl -X POST \
-  -H "Content-Type: application/json" \
-  -u "user@example.com:$CONFLUENCE_TOKEN" \
-  "https://yourorg.atlassian.net/wiki/rest/api/content" \
-  -d '{
-    "type": "page",
-    "title": "Codebase Onboarding",
-    "space": {"key": "ENG"},
-    "body": {
-      "storage": {
-        "value": "<p>Generated content...</p>",
-        "representation": "storage"
-      }
-    }
-  }'
-```
-
----
+→ See references/output-format-templates.md for details
 
 ## Common Pitfalls