Fall back to an existing bash or zsh before /bin/bash - #492
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Systems whose account shell is not bash or zsh previously resolved the hardcoded /bin/bash fallback even when that path does not exist, as on NixOS, so captured commands failed with FileNotFound and terminal sessions wedged waiting for a shell that never started. The fallback now keeps the historical platform default when it exists and otherwise probes well-known absolute locations.
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Systems whose account shell is not bash or zsh previously resolved the hardcoded /bin/bash fallback even when that path does not exist, as on NixOS, so captured commands failed with FileNotFound and terminal sessions wedged waiting for a shell that never started. The fallback now keeps the historical platform default when it exists and otherwise probes well-known absolute locations.
Supersedes #391, which was closed because its head branch carried unrelated fork history; this PR contains only the fix, rebased onto current main.