Two CodeRabbit findings on PR #2920:
1. parseRuntimeInput previously only matched the bare "16" exactly for
the all-runtimes shortcut. Inputs the prompt explicitly encourages —
"16,", "16 1", "1,16" — fell through to per-token parsing and
silently installed only Claude or a partial subset. Move the
ALL_RUNTIMES_OPTION check after tokenization so any token equal to
"16" expands. Added regression coverage in
tests/multi-runtime-select.test.cjs for the four mixed-input forms.
2. The "maps Hermes to ~/.hermes for global installs" test invoked
getGlobalDir('hermes') without isolating HERMES_HOME. On a developer
machine that exports HERMES_HOME the assertion would fail even
though getGlobalDir was behaving correctly. Save/clear/restore the
env var around the assertion, mirroring the pattern the later
describe block already uses.
Full suite: 6128/6128 pass.
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