fix(PAIUpgrade): correct SKILL_DIR path from 'Upgrade' to 'PAIUpgrade'

[pybe]

Summary

Fixes a path bug in the PAIUpgrade skill's Anthropic.ts tool that prevents it from running.

Fixes #468

Problem

The SKILL_DIR constant was pointing to .claude/skills/Upgrade instead of .claude/skills/PAIUpgrade, causing ENOENT errors when the tool tried to:

• Load sources.json
• Save state to last-check.json

Error Output

❌ Failed to load sources.json: ENOENT: no such file or directory, 
open '/home/user/.claude/skills/Upgrade/sources.json'

Solution

Updated line 82 in Releases/v2.3/.claude/skills/PAIUpgrade/Tools/Anthropic.ts:

// Before
const SKILL_DIR = join(HOME, '.claude', 'skills', 'Upgrade');

// After  
const SKILL_DIR = join(HOME, '.claude', 'skills', 'PAIUpgrade');

Testing

After this fix:

• Tool successfully loads sources.json
• Successfully monitors 30+ Anthropic sources
• Generates comprehensive upgrade reports
• Creates State directory and saves state files

Impact

• Files changed: 1
• Lines changed: 1
• Breaking changes: None
• Backward compatibility: Full

This is a critical bug fix for anyone trying to use the PAIUpgrade skill to monitor Anthropic ecosystem updates.