chore: remove outdated version tags from GitHub Actions (#457)

## Summary
- Removes version comment tags (e.g. `#v4`, `#v5`) from all GitHub
Actions workflow files
- These tags become incorrect when Dependabot updates the action SHAs
- The SHA pins are sufficient for version control

## Context
This addresses @domdomegg's comment in #453 about these tags becoming
outdated when using Dependabot. The SHAs already provide version
pinning, making the comment tags redundant and potentially misleading.

## Changes
- Removed version tags from all `uses:` statements in
`.github/workflows/*.yml`
- No functional changes to workflows

.github/workflows/claude.yml

@@ -26,7 +26,7 @@ jobs:
       actions: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 #v4
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
         with:
           fetch-depth: 1