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Classify git clone and worktree add operands so HOME-valued environment assignments, sources, references, templates, and metadata do not impersonate checkout destinations. Preserve both forms of clone --separate-git-dir as real placement targets and distinguish shell words, command boundaries, and redirections in the existing quote-aware normalized stream. Deliberate fail-closed residual: unknown future Git options with a separate following word are not adjudicated as source-only. Their value remains a possible placement, so a HOME-shaped value blocks rather than silently creating a bypass. Relative destinations whose effective path depends on cwd remain out of scope in #1197.