[gyanu2507]

Fixes #826.

LiteralNode.String() always ran TrimRight(..., "\n") on the scalar Origin. For | / |- that is fine. For |+ keep chomping it dropped the trailing blank lines, so parser.Parse then File.String() lost them and a decode of the rewritten YAML no longer matched.

Changes:

• Keep trailing newlines in Origin when the header is |+ or >+.
• When joining block mapping entries, do not insert another separator if the previous value already ends with a newline (otherwise keep blanks get inflated by one).
• In checkLineBreak, count those keep-chomped trailing blanks on the previous string token so the next key does not emit them a second time.

Test plan:

• New TestKeepBlockScalarTrailingBlanks round-trips the issue reproducer through AST String() and checks the decoded message is unchanged.
• go test ./... passes locally.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.65%. Comparing base (edee2f9) to head (af12b69).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #969   +/-   ##
=======================================
  Coverage   80.65%   80.65%           
=======================================
  Files          22       22           
  Lines        6845     6845           
=======================================
  Hits         5521     5521           
  Misses        905      905           
  Partials      419      419           

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