[owenshen0907]

Fixes #974.

At EOF, an explicitly indented block scalar such as key: |2- rejects trailing empty lines as under-indented content. Its final empty line is passed through the content-indentation check even though YAML permits those trailing lines. Validate EOF indentation only when the current line contains content, preserving the check for an under-indented final content character.

The regression tests check decoded values for 120 combinations of literal/folded style, clip/strip/keep, both indicator orders, LF/CRLF/CR, trailing blank lines and a final spaces-only line. All 120 fail on the unchanged source and pass with the fix. Another 18 cases keep rejecting under-indented content and indentation tabs, with and without a final newline.

Validation on the original macOS arm64 machine:

• Go 1.24.13 and Go 1.26.3: go test -p=4 -race ./... and go test -p=4 -race ./testdata -modfile=testdata/go_test.mod pass.
• Repository-pinned golangci-lint 2.1.2 with Go 1.24.13: 0 issues.
• Go 1.26.3: go vet -p=4 ./..., go build -p=4 ./..., gofmt and git diff --check pass.
• Existing FuzzUnmarshalToMap, bounded to 10 seconds and two workers: 369,622 executions, passed.
• Other Go/OS and i386 CI matrices were not run locally.

The change concerns accepting valid scalar content at EOF. The separately open #973 concerns the starting-line position of already parsed block tokens. Two files change; dependencies and CI remain unchanged.

Base: master at edee2f91616c6d73112a13e7c0dbde72ce938877. See #974 for the minimal reproducer and YAML 1.2.2 references.

• Describe the purpose for which you created this PR.
• Create test code that corresponds to the modification.

AI assistance was used; reproduction, implementation and validation results were reviewed locally.

CI follow-up: run 41022753745, head 43f880dca1989ae9b183318245f129bd464dfc9e, completed with 17 successful jobs, one failure and seven fail-fast cancellations. The macOS/Go 1.21 job used macOS 26.6.2 and Go 1.21.13; dyld aborts the root test binary before tests start with missing LC_UUID load command. This matches the baseline loader failure previously reproduced on unchanged master for #954; it is not a failed assertion in the new regression. Linux race jobs for Go 1.21-1.24 and the i386 jobs pass. Hosted CI is not fully green, and cancelled jobs remain unverified. No workflow change or rerun was made.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.71%. Comparing base (edee2f9) to head (43f880d).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #975      +/-   ##
==========================================
+ Coverage   80.65%   80.71%   +0.06%     
==========================================
  Files          22       22              
  Lines        6845     6846       +1     
==========================================
+ Hits         5521     5526       +5     
+ Misses        905      902       -3     
+ Partials      419      418       -1     

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