Backport: fix(amazon-bedrock): preserve reasoning text when signature is present#13979
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#13972) ## background `trimIfLast()` trims trailing whitespace from reasoning block text even when a cryptographic `signature` is present. the signature is computed over the exact original bytes - trimming even a single trailing newline invalidates the text/signature pair, causing Bedrock to reject with `ValidationException: thinking blocks cannot be modified` ## summary - skip `trimIfLast` for reasoning blocks that have a signature - reasoning blocks without a signature still get trimmed as before - add test for multi-turn tool use with signed reasoning blocks ## checklist - [x] tests have been added / updated (for bug fixes / features) - [ ] documentation has been added / updated (for bug fixes / features) - [x] a _patch_ changeset for relevant packages has been added (run `pnpm changeset` in root) - [x] i have reviewed this pull request (self-review) ## related issues fixes #13583
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This is an automated backport of #13972 to the release-v6.0 branch. FYI @dancer