[Feature Idea] Timeout & Retry

[albertalef]

Problem: Commands can hang forever; flaky commands need manual retry logic.

Solution: Add _timeout and _retry options.

# Timeout after 5 seconds
sh do
  curl("https://slow-api.example.com", _timeout: 5)
end
# Raises RubyShell::TimeoutError

# Retry on failure
sh do
  curl("https://flaky-api.example.com",
       _retry: 3,                    # Max 3 attempts
       _retry_delay: 1,              # Wait 1 second between retries
       _retry_backoff: :exponential) # 1s, 2s, 4s delays
end

# Combine timeout and retry
sh do
  curl("https://api.example.com",
       _timeout: 10,
       _retry: 3,
       _retry_on: [RubyShell::TimeoutError, RubyShell::CommandError])
end

Implementation:

• Add Timeout.timeout wrapper in TerminalExecutor.capture
• Create retry loop with configurable delay/backoff
• New RubyShell::TimeoutError exception class