* Add explicit wrap_parameters to controllers for flat JSON API support
Virtual attributes (has_rich_text, has_one_attached, delegated setters,
ActiveModel attrs) are not in Model.attribute_names, so wrap_parameters
auto-detection silently drops them from flat JSON requests. Add explicit
include: lists matching each controller's permitted params.
* Convert short-form wrap_parameters to explicit include: lists
Defense-in-depth: these controllers only have real-column params today,
so auto-detection works, but explicit lists prevent future regressions
if virtual attributes are added.
* Add flat JSON param tests for all wrap_parameters controllers
17 new tests covering every controller with wrap_parameters, verifying
that flat (unwrapped) JSON payloads are correctly wrapped and processed.
Focuses on virtual attributes that would be silently dropped without
explicit include: lists.
Jeremy Daer