fix(server): allow STDOUT#puts with no arguments (blank line)

[crossi-dev]

Fixes #6

Problem

Terminalwire::Server::Resource::STDOUT#puts is declared with a required argument:

def puts(data)
  command("print_line", data: data)
end

So calling context.puts with no arguments raises ArgumentError: wrong number of arguments (given 0, expected 1). Ruby's stdlib puts with no args is valid and prints a blank line, so this is a surprising crash for an otherwise drop-in API.

Fix

Make the argument optional and coerce with to_s, matching stdlib puts semantics (no args / nil → blank line):

def puts(data = nil)
  command("print_line", data: data.to_s)
end

One-line change, plus two RSpec cases covering the no-arg and nil paths.

Verified

The repo's integration suite uses pty (Linux pseudoterminal), which I can't run on my machine, so I verified the method logic directly:

BEFORE (def puts(data)):
  puts("Hello")  → "Hello"   PASS
  puts()         → ArgumentError: wrong number of arguments (given 0, expected 1)   ← bug
  puts(nil)      → ""         PASS

AFTER (def puts(data = nil)):
  puts("Hello")  → "Hello"   PASS
  puts()         → ""         PASS
  puts(nil)      → ""         PASS

---

Came across Terminalwire and noticed #6 had been open a while, so I went ahead and fixed it. No strings attached — I'm with Choreless and we like contributing real fixes to projects we use. If it's useful and you ever want a hand with something larger, happy to help.

— Charles