GH#3746: Fix broken code block fences and add PATH note in Playwriter docs

[marcusquinn]

Summary

• Fix 8 code blocks in playwriter.md that used ```text as closing fence instead of ```, breaking syntax highlighting and rendering subsequent content as plain text blocks
• Add PATH guidance note to Claude Desktop MCP config example per CodeRabbit review feedback

Details

The Playwriter documentation had a systematic bug where JavaScript code blocks were closed with ```text instead of ```. This caused:

1. The closing fence to be interpreted as an opening fence for a new text code block
2. The content between the broken closing and the next code block opening to render as plain text inside a code block
3. Loss of syntax highlighting for the affected JavaScript examples

Also addresses CodeRabbit feedback from PR #153 about the Claude Desktop config example not mentioning the full npx path, which is inconsistent with the OpenCode example that recommends it for reliability.

Verification

• markdownlint-cli2: 0 errors
• Only remaining ```text is the legitimate opening fence for the ASCII architecture diagram (line 228)

Closes #3746

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🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 399 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Tue Mar 10 04:24:21 UTC 2026: Code review monitoring started
Tue Mar 10 04:24:22 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 399

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 399
• VULNERABILITIES: 0

Generated on: Tue Mar 10 04:24:24 UTC 2026

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Generated by AI DevOps Framework Code Review Monitoring

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud