jhheider / scriptbox / 29661829250

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Join $0 reset onto the first body line (line-faithful + lint-clean); add emit + shellcheck compat check (#4)

The $0 rewrite used to swap the shebang line, which dropped the shell dialect
(shellcheck added SC2148) and left shebang-less scripts unrewritten. Now the reset
is joined onto the first body line with `;` - after the shebang if present, else at
the start. This adds no line (error line numbers stay exact, restoring the
line-number fidelity the swap had) AND keeps the shebang on line 1 (lint-clean).
bash>=5/zsh get the real $0 with or without a shebang; dash/ksh still need
--argv0 source. Checksum gate unaffected (runs over pre-rewrite bytes).

- `scriptbox emit [interp] <script>`: print the exact bytes it would run, without
  running - for debugging and as a shellcheck target.
- compat suite: a shellcheck check that `scriptbox emit` adds no finding the
  original lacks, across every idiom x bash/zsh (83 pass / 0 fail on Linux). Adds
  shellcheck to the Dockerfile.

Full test suite + clippy clean; compat green on Linux and macOS.


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

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

31 of 49 new or added lines in 3 files covered. (63.27%)

932 of 1275 relevant lines covered (73.1%)

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