Commit the AI-authored design doc driving this branch's
7-commit `brokerd` -> (`datad` + `brokerd`) split; all
prior commits' `Prompt-IO:` entries reference its
stages so this makes those refs resolvable in-repo for
PR review.
Also,
- add the doc's own prompt-io entry pair (scope: docs)
incl. a 4-item implementation-deviation log vs. the
plan as written.
(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Prompt-IO: ai/prompt-io/claude/20260610T173309Z_f15f8178_prompt_io.md
Gud Boi