fix(ssh): fix support for remotes that use fnm

[soorria]

Summary

• Replace the remote SSH fnm bootstrap's invalid fnm env --shell sh usage with fnm env --shell bash.
• Run fnm use once after environment initialization so remote Node resolution matches the one-shot activation pattern used for other version managers.
• Update SSH tunnel script coverage to assert the new fnm activation commands.

Why

fnm env --shell sh is not a supported fnm shell value, so the existing remote bootstrap could silently fail to initialize fnm in non-interactive SSH sessions.

We also avoid fnm env --use-on-cd --shell sh because --use-on-cd emits hook code containing Bash-style [[ ... ]] conditionals, which are not supported by dash or POSIX sh. The remote runner is a #!/bin/sh script, so one-shot fnm use is a better fit than installing directory-change hooks.

Test Plan

• bun --filter @t3tools/ssh test -- src/tunnel.test.ts
• bun fmt && bun lint && bun typecheck

Made with Cursor

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Note

Low Risk
Low risk: small, isolated change to the generated remote shell bootstrap for fnm, plus test expectation updates; main risk is behavior differences on systems where fnm env --shell bash isn’t available.

Overview
Fixes remote Node bootstrapping for hosts using fnm by replacing the unsupported fnm env --shell sh/--use-on-cd initialization with eval "$(fnm env --shell bash)" and then running a one-shot fnm use (--silent-if-unchanged with fallback to default).

Updates tunnel script tests to assert the new fnm activation and fnm use commands in the generated remote runner.

^{Reviewed by Cursor Bugbot for commit 7434d75. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix fnm support in SSH remote node path setup

The ensure_remote_node_path function in tunnel.ts previously tried to initialize fnm using sh with --use-on-cd but never called fnm use, so the correct Node version was not activated.

• Now evaluates fnm env --shell bash and explicitly runs fnm use --silent-if-unchanged, falling back to fnm use default on failure.
• All fnm invocations are silenced (>/dev/null 2>&1) and guarded to avoid errors on remotes where fnm is absent.
• Behavioral Change: remotes using fnm will now have an active Node version on PATH where previously they did not.

^{Macroscope summarized 7434d75.}

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[macroscopeapp]

Approvability

Verdict: Approved

Straightforward bug fix modifying fnm shell initialization in SSH tunneling scripts. Limited scope, clear intent, and test coverage updated to match.

^{You can customize Macroscope's approvability policy. Learn more.}