Fix changeset release parsing for quoted text

[konard]

Summary

• Fix scripts/release/apply-changesets.sh so changeset descriptions are trimmed without xargs, preventing apostrophes like buildx's from aborting release CI.
• Read changeset files with NUL-delimited find ... -print0 and Bash arrays, which is safer for quoted text and filenames.
• Add a focused regression experiment plus an issue-84 case study with preserved CI logs and template comparison.

Validation

• GITHUB_BASE_REF=main GITHUB_HEAD_REF=issue-84-d3cc33387574 scripts/release/validate-changeset.sh
• GITHUB_BASE_REF=main GITHUB_HEAD_REF=issue-84-d3cc33387574 scripts/release/check-version.sh
• bash -n scripts/release/apply-changesets.sh
• experiments/test-issue84-apply-changesets-quotes.sh
• experiments/test-issue82-pr-parallel-tests.sh
• git show --check --stat --oneline HEAD

Evidence

• Case study: docs/case-studies/issue-84/CASE-STUDY.md
• Failed job log: docs/case-studies/issue-84/ci-logs/job-73637479652.log
• Reproducer: experiments/test-issue84-apply-changesets-quotes.sh

Closes #84

[konard]

Solution summary

Implemented and pushed the fix to PR #85: #85

Root cause was the release script using xargs to trim changeset descriptions, which broke on apostrophes like buildx's. I updated apply-changesets.sh to avoid xargs, use safer NUL-delimited changeset discovery, and added a regression test in experiments/test-issue84-apply-changesets-quotes.sh.

Also added the issue #84 investigation artifacts and CI logs under docs/case-studies/issue-84, plus a patch changeset.

Verified locally:

• bash -n on changed release/test scripts
• quote regression experiment passed
• issue Fix all CI/CD bugs #82 PR test layout experiment passed
• release checks passed: validate-changeset.sh, check-version.sh
• dry-run apply against real pending changesets no longer hits the xargs failure

PR is ready for review, working tree is clean, and the latest GitHub Actions run 25153457364 passed on commit 25782a5c08dd7346fbf72a62df468f9f4e2d79c8.

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[konard]

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[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

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