feat(shell): PATH-based command resolution and completion

[FlareCoding]

Summary

• The shell hardcoded /bin for command lookup and tab completion, ignoring the PATH now seeded by init.
• resolve_cmd walks PATH probing candidates with access(X_OK), preserving the /bin fallback and failure messaging when PATH is unset or nothing matches.
• Command completion collects from every PATH directory with duplicate names deduped after sorting. Bare names still never execute from the current directory.

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PATH match accepts any node

Medium Severity · Logic Bug

resolve_cmd treats a successful access(..., X_OK) as proof it found the command and stops walking PATH. On this OS, access/faccessat succeeds for any resolvable node, including directories and non-executables, so an earlier shadowing name prevents later valid binaries from being tried and surfaces as command not found.

 

^{Reviewed by Cursor Bugbot for commit 3bb54d8. Configure here.}