[wp-trac] [WordPress Trac] #64867: Improve AI Client error handling

[WordPress Trac]

#64867: Improve AI Client error handling
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 Reporter:  flixos90        |      Owner:  flixos90
     Type:  task (blessed)  |     Status:  assigned
 Priority:  normal          |  Milestone:  7.0
Component:  AI              |    Version:
 Severity:  normal          |   Keywords:  needs-patch needs-unit-tests
  Focuses:                  |
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 The `WP_AI_Client_Prompt_Builder` currently relies on very generic
 `WP_Error` objects, without a lot of context. This leads to two problems:

 - Much of the granular context that the PHP AI Client exceptions provide
 is lost.
 - The `WP_Error` objects are not very useful in HTTP context, e.g. in REST
 API responses.

 We should enhance the logic in the class to leverage the PHP AI Client
 exception classes more granularly, and include a `status` in data for the
 HTTP status code, so that these `WP_Error` objects are ready to use as
 e.g. REST responses.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64867>
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