A running Codeman remembers a missing CLI for up to 5 minutes, so a status
poll never spawns a login shell, and its Run button reads that same memory.
So "Run fails, add the agent, Run again" kept saying the CLI was not
installed, right after the app had said it was ready.
install.sh now touches `cli-installed` in the data dir once a CLI has landed,
and resolve() leaves the backoff when that file's mtime changes. It is one
stat, inside the backoff branch, and buys one run of the chain, so a resolved
CLI never pays for it and a CLI that is still missing goes back to waiting.
Re-walking PATH during the backoff would have found hand installs too, but it
would put a synchronous stat of every PATH entry on the request path, where
one dead network mount freezes the server (#516), and execute candidates that
were already refused.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>