Fix comment parsing on anchors and aliases

[joshuapare]

Fixes two bugs around alias parsing (discovered while fixing #608) that occurred when CommentToMap was enabled with comments present on alias lines:

• alias lookup failed with "could not find alias" error because the lookup used the string representation (which included the comment) instead of the token value
• comments on alias lines were attached to the alias name StringNode but weren't propagated to the AliasNode, so CommentToMap never extracted them

Example:

anchor: &anc value
alias: *anc # comment <--- this would throw an error of "could not find alias 'anc'" when CommentToMap was enabled

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 60.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.35%. Comparing base (b0ab069) to head (e790356).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #815      +/-   ##
==========================================
- Coverage   80.48%   80.35%   -0.13%     
==========================================
  Files          22       22              
  Lines        6845     6863      +18     
==========================================
+ Hits         5509     5515       +6     
- Misses        914      920       +6     
- Partials      422      428       +6     

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[goccy]

Thank you for your contribution !!! I've commented

[goccy]

Please add the test cases for anchor_flow and anchor_map

[joshuapare]

sorry for the wait! This actually found a bug, sequence anchor ending comments weren't getting picked up. it's fixed now 👍

[Copilot]

Pull request overview

This PR fixes two bugs that occurred when CommentToMap was enabled with comments present on alias lines. The first bug caused alias lookup to fail because it used the string representation (which included comments) instead of the token value. The second bug prevented comments on alias lines from being propagated to the AliasNode, causing CommentToMap to miss them.

• Fixed alias lookup to use token value instead of string representation
• Added comment propagation from alias name to alias node
• Added comprehensive test coverage for anchors and aliases with comments

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
decode.go	Fixed alias lookup to use GetToken().Value instead of String() to avoid including comments in the lookup key
parser/parser.go	Added comment propagation from alias name StringNode to AliasNode to ensure CommentToMap can extract alias comments
testdata/yaml_test.go	Added test case covering anchors and aliases with comments for scalar values, flow sequences, and flow maps

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