Add the setup command to dash_kit

[tylercschneider]

One Sentence Summary

A developer new to the dash_kit gem can run one setup command after installing the bundle and finish with the tests passing.

ACs Covered

• A developer in a fresh clone who installs the bundle and runs the setup command ends with the test suite passing.
• Every check the setup command runs in this repo is a shell command that starts no Rails app and opens no browser page.
• The setup command lists two Claude Code requirements, the shared rules and the subagents the bundle provides, under a group named Claude tooling.
• A developer can ask the setup command for status and see the requirements added to the repo since their last run.
• Git ignores the record the setup command writes for each developer.
• The README tells a developer how to run the setup command and the status command.

Decision Log

How does dash_kit get the dev_onboarder gem?

The Gemfile takes the gem from its GitHub repo at a tag and does not load it with the bundle, over a release to RubyGems.

Code Example

Not relevant.

Out of Scope

• Adding the setup command to the other gems and apps is left to each of those repos.

Ticket Billed Against

Not specified.

Tokens Used

• Input: 16
• Output: 3,820
• Cache read: 2,366,007
• Cache write: 67,443
• Total: 2,437,286

Effort

Not measured.

Closes tylercschneider/dyb_web#919

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Generation Metadata

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Rules: pr-body ccaf516, draft-reading 0c52049, writing-style f190206
Model: claude-opus-5-5, cc 2.1.287