Part of the platform-contract intake (#25). Covers both pieces of work
that must land before first deploy to home-ctr-onyx.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds the brainstorm-phase design for inline name/amount/notes edit on
the budget template page. Layout variant A (swap in place), notes folded
into edit mode, no schema change, forward-facing only.
Also adds .superpowers/ to .gitignore so the brainstorm companion's
working dir does not end up tracked.