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feat: Add 'pending' state to 'task_list_marker' #160

Job	Run time
Test parsers (windows-latest)	57s
Validate queries (markdown)	39s
Validate queries (markdown-inline)	12s
Fuzz parsers (tree-sitter-markdown)	8s
Test parsers (macos-latest)	28s
Test parsers (ubuntu-latest)	13s
Fuzz parsers (tree-sitter-markdown-inline)	10s
	2m 47s