[gyanu2507]

Fixes #807.

Marshaling a string that is only a newline produced | (clip). Clip strips that only line break, so Unmarshal got back "" instead of "\n".

LiteralBlockHeader now returns |+ when the value is exactly one line-break character. That matches the keep-chomping form |+\n\n, which already round-trips correctly. Other multiline cases are unchanged.

This is separate from #792, which quotes leading whitespace via IsNeedQuoted. The block-header path is what emits | / |+ for newline-containing strings.

Test plan:

• New TestLiteralBlockHeader cases, including "\n" and "\r".
• Encoder case expecting |+\n\n for "\n".
• go test ./... passes locally.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.69%. Comparing base (edee2f9) to head (6cb8860).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #968      +/-   ##
==========================================
+ Coverage   80.65%   80.69%   +0.03%     
==========================================
  Files          22       22              
  Lines        6845     6847       +2     
==========================================
+ Hits         5521     5525       +4     
+ Misses        905      903       -2     
  Partials      419      419              

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