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Pull #2778

github

Rename Grape::Endpoint's for: keyword to api: and expose #api

`for` identified the API an endpoint belongs to, but it is a reserved
word: it can only reach `Options` through `**rest` and its value can't be
referenced as a local. Rename it to `api:`, an explicit keyword on
`Grape::Endpoint#initialize`, and drop the `**rest` workaround from
`Options`.

`api` stays in `config` because it is load-bearing: the endpoint reaches
the mounting API's live `configuration` (used by remountable APIs and
read lazily at request time) through it, so it cannot be captured at
construction. `logger` and the new public `#api` reader are exposed via
`Forwardable` delegation to the config value object.

The owning API is no longer carried on the endpoint's public options Hash
(`endpoint.options[:for]` is gone); use `endpoint.api` instead. Only
in-repo reader was one spec. Documented in UPGRADING.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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