v0.0.74

• Added a new ExecuteRI tool that queries Ruby’s ri command and returns
  JSON containing the executed command and its output or error details.
• Updated Fetcher.execute to accept an array of strings, automatically
  joining them into a shell‑safe command when necessary.
• Extended the gemspec to include the ExecuteRI tool, its spec, and related
  files.
• Refactored the GetCurrentWeather tool to use the Pirate Weather API,
  added a PIRATEWEATHER_API_KEY configuration key, updated the default URL
  template, removed the legacy DWD sensor dependency, and added a new
  pirateweather.json asset with corresponding tests.
• Made the write_file tool nil‑safe, added explicit handling for
  'append', 'overwrite', and nil (treated as overwrite), and raised an
  ArgumentError for unsupported modes; tests now verify structured error
  responses.
• Removed the unnecessary tins/secure_write dependency.
• Enhanced the /input command to accept multiple glob patterns:
  InputContent#input now takes an array of patterns, choose_filename
  aggregates matches via Pathname.glob, and file contents are read using
  filename.read.
• Introduced a system prompt flag and improved model handling: added
  @setup_system_prompt, updated Chat#start to conditionally set the system
  prompt, refined use_model to manage think and tools support, and updated
  capability output to use safe navigation.
• Updated the default configuration to enable the ExecuteRI tool by default.