## Description
The group members page could not distinguish an unlimited Everyone
fallback from a configured budget on the Everyone group when viewing
another group, so it incorrectly displayed `Unlimited` and `Everyone
(not allocated)` despite the configured Everyone budget.
The member spend response now includes `effective_budget` as the
canonical budget that currently applies to the user. The existing
`group_budget` field remains for backward compatibility and is
deprecated in favor of `effective_budget`.
## Changes
- Add `effective_budget` to group member AI spend responses.
- Deprecate `group_budget` in favor of `effective_budget`.
- Display budgeted Everyone as the governing group instead of
`Unlimited` and `Everyone (not allocated)`.
- Add database, API, conversion, and Storybook coverage.
Closes https://linear.app/codercom/issue/AIGOV-588
> [!NOTE]
> Generated by Coder Agents on behalf of @ssncferreira.
Susana Ferreira
276d0a8586