jhheider / scriptbox / 29660994211

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Fix $0 rewrite for shebang-less scripts (closes #1) (#3)

The --argv0 rewrite injected the $0 reset by swapping the line-1 shebang, so a
script with no shebang run via an explicit `scriptbox <shell> script` silently
kept $0 as the fd path even on bash>=5/zsh. Now, when there is no shebang to
swap, prepend the reset as a new line 1 (a 1-line offset in error line numbers,
the small price of getting $0 right). bash>=5/zsh resolve the real path with or
without a shebang; dash/ksh still need --argv0 source; macOS bash 3.2 has no
BASH_ARGV0 either way.

Checksumming is unaffected: the pin gate runs over the pre-rewrite bytes
(run.rs), so a pin verifies the file on disk whether or not a shebang is present
- added a plan() test proving a pinned shebang-less script both verifies and gets
the prologue prepended.

Also updates the compat suite's annotations (finding -> fixed).

Closes #1


Claude-Session: https://claude.ai/code/session_014psyX18vgHn4UkMwCtZqff

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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