update-agent-context scripts fail to refresh 'Last updated' date from template

[mango766]

Hi,

I ran into an issue where the update-agent-context scripts (both bash and PowerShell) don't refresh the "Last updated" timestamp in agent files that were generated from the template.

The template outputs plain text:

Last updated: 2025-03-01

But both scripts look for bold Markdown markers:

**Last updated**: 2025-03-01

So the regex never matches and the date is never refreshed on subsequent runs.

This seems to be the same issue as #1823.

Files:

• scripts/bash/update-agent-context.sh (line ~479)
• scripts/powershell/update-agent-context.ps1 (line ~334)