Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/commands/accounts.ts`:
- Around line 26-28: The code prints account?.account_id directly, which yields
"undefined" when the API response lacks account_id; update the handling around
the account variable (the Record<string, unknown> named account and the
console.log(account?.account_id) call) to check for the presence of account and
account.account_id and output a clear fallback or error message instead (e.g.,
"Account ID not found" or return a non-zero exit/error), so users don't see an
ambiguous "undefined".

In `@src/commands/keys.ts`:
- Around line 66-68: The current else branch prints console.log(data.message)
which can output "undefined" if message is missing; update the handler in
src/commands/keys.ts that contains the console.log(data.message) to safely fall
back to a meaningful string (e.g., data.error, data.detail, or
JSON.stringify(data)) when data.message is undefined; ensure you check for data
&& data.message first and then print the chosen fallback so the command never
prints "undefined".
- Around line 43-45: The current else branch prints data.key directly, which can
output "undefined" if the API response lacks a key; update the logic in the keys
command (the block that currently does "console.log(data.key)") to validate the
response by checking that data and data.key are present and non-empty, and if
not, print a clear explanatory message (e.g., "No key returned from API") and
exit with a non-zero status or return an error; ensure you reference and update
the same branch that currently logs data.key so callers get explicit feedback
instead of undefined.