Greptile Summary

This is a changelog-only PR that adds the missing 2026.3.8 fix entry for the Amazon Bedrock Too many tokens per day rate-limit failover fix that landed in #39377.

• The entry is correctly placed in the ### Fixes subsection of ## 2026.3.8.
• The format, PR reference (#39377), and contributor attribution (@gambletan) are consistent with surrounding entries.
• No functional code changes are included; this is a documentation-only update with no risk.

Confidence Score: 5/5

• This PR is safe to merge — it is a documentation-only changelog addition with no functional changes.
• Single-line addition to CHANGELOG.md with correct placement, formatting, and attribution. No code is modified, and there are no logical or syntactic issues.
• No files require special attention.

_{Last reviewed commit: ae5794a}