initial: remote-run + tssh + installer

.gitignore

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+.DS_Store
+*.swp

README.md

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+# session-tools
+
+Resilient remote-execution wrappers for SSH/tmux patterns across the lilith
+host fleet (plum, apricot, black, quinn-vps, ...).
+
+The premise: a bare `ssh host cmd` dies the moment the transport hiccups,
+killing whatever was running on the remote. These wrappers run commands inside
+a detached tmux session on the remote so the work survives the SSH drop.
+
+## Tools
+
+- **`bin/remote-run <host> <cmd...>`** — One-shot command runner. Spawns a
+  detached tmux session on `<host>`, streams stdout/stderr back to your
+  terminal, propagates the exit code. If the local ssh dies mid-run, the tmux
+  session continues; reattach with `ssh <host> tmux ls` then
+  `ssh <host> tmux attach -t <session>`.
+
+- **`bin/tssh <host>`** — Interactive shell wrapper. Auto-attaches to (or
+  creates) a per-user tmux session on `<host>` named `claude-$(whoami)`.
+  Detach with `Ctrl-b d`; transport drops don't kill the shell.
+
+## Install
+
+On every host that should have these on `$PATH`:
+
+```sh
+git clone http://forge.black.local/lilith/session-tools.git ~/Code/@scripts/session-tools
+~/Code/@scripts/session-tools/install.sh
+```
+
+Symlinks `bin/remote-run` and `bin/tssh` into `~/bin`. Pulls future updates
+via plain `git pull` — symlinks track the repo automatically.
+
+## When to use what
+
+| Scenario                                   | Use                                          |
+|--------------------------------------------|----------------------------------------------|
+| Interactive shell on a remote              | `tssh <host>`                                |
+| One-off command (build, test, query)       | `remote-run <host> "<cmd>"`                  |
+| Long-running job (>1h, must survive reboot)| `systemd --user` unit on the remote, not ssh |
+
+## Per-host shims (optional)
+
+If a particular host gets used a lot, drop a one-liner into `~/bin/`:
+
+```sh
+# ~/bin/apricot-run
+#!/bin/sh
+exec remote-run apricot "$@"
+```

bin/remote-run

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+#!/bin/sh
+# remote-run <host> <cmd...>
+#
+# Run a command on <host> inside a detached tmux session, stream output back,
+# propagate exit code. If the local ssh dies mid-run, the tmux session keeps
+# going on the remote — recover with:
+#     ssh <host> tmux ls
+#     ssh <host> tmux attach -t <session>
+#
+# <host> is whatever ssh accepts: a Host alias from ~/.ssh/config, a
+# user@hostname, an IP, etc.
+
+set -eu
+
+if [ $# -lt 2 ]; then
+    echo "usage: $0 <host> <cmd...>" >&2
+    exit 2
+fi
+
+host=$1
+shift
+
+session="claude-$(whoami)-$$-$(date +%s)"
+
+# Single-quote-escape the user command for safe embedding in remote bootstrap.
+user_cmd=$*
+quoted_cmd=$(printf %s "$user_cmd" | sed "s/'/'\\\\''/g")
+
+# Remote bootstrap — runs the user command in its own bash subshell so that
+# any `exit` or `set -e` inside it does NOT short-circuit our exit-capture.
+remote_cmd=$(cat <<REMOTE
+session='${session}'
+log="/tmp/\${session}.log"
+exitf="/tmp/\${session}.exit"
+: > "\$log"
+tmux new-session -d -s "\$session" "bash -c '${quoted_cmd}' > \$log 2>&1; echo \\\$? > \$exitf; tmux wait-for -S done-\$session" 2>/tmp/\${session}.tmuxerr
+if [ \$? -ne 0 ]; then
+    echo "tmux failed to start session:" >&2
+    cat /tmp/\${session}.tmuxerr >&2
+    rm -f /tmp/\${session}.tmuxerr
+    exit 127
+fi
+rm -f /tmp/\${session}.tmuxerr
+( tail -F "\$log" 2>/dev/null ) &
+tail_pid=\$!
+tmux wait-for done-\$session 2>/dev/null
+sleep 0.2
+kill \$tail_pid 2>/dev/null || true
+wait \$tail_pid 2>/dev/null || true
+code=\$(cat "\$exitf" 2>/dev/null || echo 1)
+tmux kill-session -t "\$session" 2>/dev/null || true
+rm -f "\$log" "\$exitf"
+exit \$code
+REMOTE
+)
+
+ssh "$host" "$remote_cmd"

bin/tssh

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+#!/bin/sh
+# tssh <host>
+#
+# Interactive ssh that auto-attaches to (or creates) a per-user tmux session
+# on the remote, so transport drops don't kill your shell.
+#
+# Detach with Ctrl-b d. Reattach by re-running this command.
+# Session name: claude-$LOCAL_USER on the remote box.
+
+set -eu
+
+if [ $# -lt 1 ]; then
+    echo "usage: $0 <host>" >&2
+    exit 2
+fi
+
+host=$1
+session="claude-$(whoami)"
+
+exec ssh -t "$host" "tmux new-session -A -s '${session}'"

install.sh

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+#!/bin/sh
+# install.sh — symlink session-tools/bin/* into ~/bin (idempotent).
+#
+# Run this on every host that should have remote-run / tssh available.
+
+set -eu
+
+repo_dir=$(cd "$(dirname "$0")" && pwd)
+target=${HOME}/bin
+
+mkdir -p "$target"
+
+for src in "$repo_dir"/bin/*; do
+    name=$(basename "$src")
+    link="$target/$name"
+    if [ -L "$link" ] && [ "$(readlink "$link")" = "$src" ]; then
+        echo "ok:    $link -> $src"
+        continue
+    fi
+    if [ -e "$link" ] && [ ! -L "$link" ]; then
+        echo "skip:  $link exists and is not a symlink — leaving alone" >&2
+        continue
+    fi
+    ln -sfn "$src" "$link"
+    echo "link:  $link -> $src"
+done
+
+case ":$PATH:" in
+    *":$target:"*) ;;
+    *) echo "note:  add $target to PATH if it isn't already" ;;
+esac