CHANGELOG — documentation safety update v163
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This update does not change the core PHP tool behavior from v162.

Added:
- 000-START-HERE-STEP-BY-STEP.html
- 000-START-HERE-CHECKLIST.txt

Purpose:
- Explain exactly where each file goes.
- Preserve the CloudFront/PHP tool procedure for future use.
- Make the package usable even after long gaps between maintenance sessions.