The dynamic parser walker from the contributor's commit lost the profile
name tab-completion that existed in the old static generators. This adds
it back for all three shells:
- Bash: _hermes_profiles() helper, -p/--profile completion, profile
action→name completion (use/delete/show/alias/rename/export)
- Zsh: _hermes_profiles() function, -p/--profile argument spec, profile
action case with name completion
- Fish: __hermes_profiles function, -s p -l profile flag, profile action
completions
Also removes the dead fallback path in cmd_completion() that imported
the old static generators from profiles.py (parser is always available
via the lambda wiring) and adds 11 regression-prevention tests for
profile completion.
b867171291