futpib / parser / 23097771215

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Fix heredoc parser failing on indented delimiters

The heredoc parser required the terminating delimiter to match exactly
with no leading whitespace. When a heredoc had an indented terminator
(e.g. inside a command substitution in an indented context), the parser
would never find the end, consuming everything past the delimiter and
causing parse failures.

Fix by trimming leading whitespace before comparing lines to the
delimiter, similar to bash's <<- behavior but extended to spaces.

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