mcp.md called it `hivectl choom`; the verb is `hivectl agent <name>
choom`. observability.md cited `hivectl shell`, which has never existed
at any level — the sentence only needs a shell, so it names one instead of
guessing which command an operator reaches for.
Found by subtracting the generated hivectl-cli.md's command headings from
every hivectl citation in docs/. Re-running it after the fix drops the
candidate list from 16 to 14, losing exactly these two.
Closes#4159
d2175c84b3