feat: elvish Wrapper via cdd init elvish #47

What problem are you trying to solve?

cdd init supports fish, bash, and zsh only. Elvish users cannot Jump: the binary prints a path but there is no Wrapper to change the caller's directory.

Proposed solution

Add elvish to cdd init, sourced from rc.elv:

eval (cdd init elvish | slurp)

The emitted script defines fn cdd {|@args| ...} in the user's namespace. It forwards pass-through subcommands with e:cdd, otherwise captures e:cdd pick $@args, checks the exit status, guards against an empty result, and runs builtin:cd.

Alternatives considered

• None. Elvish has no way to change the caller's directory from a child process either, so a function is required.

Additional context

• Ruled out of scope for v0.1.0 on the wayfinder map: Wayfinder map: cdd v0.1.0 #2
• starship and zoxide both ship an elvish init; zoxide's template is the closest reference: https://github.com/ajeetdsouza/zoxide/blob/main/templates/elvish.txt