Module completion_plan 

Pure shell-completion validation (no clap / script I/O / recovery copy).

Core owns shell name parsing and a typed error. Presentation (RecoveryAdvice kind/summary/hint/example) is CLI-owned.

Enums

CompletionShell

Shells that Heddle emits completion scripts for.

CompletionShellError

Failure to parse a completion shell name.

Functions

parse_completion_shell

Parse a user-supplied shell name into a known completion target.