[WiP] feet: Add tab-completion

[S0AndS0]

Describe your changes

This is, for now, a work in progress and aims to address Issue #134 by adding/incorporating kongcompletion... tragically this change is currently hampered by a bit of skill-issues for resolving the following follow-up issue that these changes introduce;

go build && ./freeze --help
#>                             
#>   ERROR  Something went wrong
#>                              
#>  can't mix positional arguments and branching arguments on *main.Config

... so if anyone wants to help tackle this with me, I'd much appreciate a helping hand :-)

Related issue/discussion:

• Add shell autocompletion for available options #134

Checklist before requesting a review

• I have read CONTRIBUTING.md
• I have performed a self-review of my code

If this is a feature

• I have created a discussion
• A project maintainer has approved this feature request. Link to comment:

---

Updates/edits

2025-06-17

Got past previous parser errors!... only to face-plant on the following knotty states;

go build
./freeze --shell bash
#>
#>   ERROR  File not found
#>
#>  open : no such file or directory
./freeze --code 1
#>
#>   ERROR  File not found
#>
#>  open 1: no such file or directory