[cdalar]

Summary

• Adds scripts/install-dev.sh, a one-command wrapper for installing/updating onctl-dev (the onctl-dev Homebrew formula added in Add onctl-dev formula: build onctl from main HEAD homebrew-tap#2, which builds onctl from main).
• Avoids needing to remember brew install --HEAD --fetch-HEAD cdalar/tap/onctl-dev — the same command handles both first install and pulling newer main commits.

Test plan

• Ran the script locally; confirmed it correctly reports onctl-dev is already up to date when main hasn't changed
• Verified --HEAD --fetch-HEAD is the correct combined flag for install-or-update-to-latest-HEAD semantics

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.58%. Comparing base (30f3333) to head (34e46d0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #931   +/-   ##
=======================================
  Coverage   22.58%   22.58%           
=======================================
  Files          42       42           
  Lines        4176     4176           
=======================================
  Hits          943      943           
  Misses       3114     3114           
  Partials      119      119           

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