A slash only opened completions at position 0, so `please run /cle`
suggested nothing. That is correct for execution — commands only run from
the start of a message — but it also removed the ability to reference a
skill inside prose.
Position 0 and mid-message are now detected separately. A leading slash
stays a command invocation with arg completion and the full command set; a
slash after whitespace is an inline skill reference. Only skills are
offered there, since a built-in like /model or /new acts on the app and
reads as nothing useful inside a sentence.
The gateway tags each completion with its kind, derived from the same
skill-command and skill-bundle providers the completer already consumes,
so the TUI filters on data rather than sniffing the display meta glyphs.
applyCompletion keyed its leading-slash check off the start of the input,
which is only the replace point for a position-0 command. It now keys off
the character before compReplace, so an inline pick lands as
`please run /clean` instead of `please run //clean`. The Tab handler
carried its own divergent copy of that logic and now calls the shared
helper.
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