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Fix parser: support backslash line continuation (#333)

The moo lexer had no token rule for a bare backslash, so an explicit
line-continuation ("\" immediately followed by a newline) caused moo
itself to throw "invalid syntax" before the parser ever ran. Add a
continuation token for "\\\r?\n" and skip it like whitespace/comments
in processTokens, so no NEWLINE/INDENT/DEDENT is emitted and the two
physical lines join into one logical line, per Python semantics.

Fixes #329


Claude-Session: https://claude.ai/code/session_01KrwJGug3rCXijRseRjys9V

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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