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Find params declared with String names under build_with :hash (#3069)

Under `build_with :hash` a request's params have Symbol keys, but a name
declared as a String was looked up as written and found nothing:
`requires 'beer'` answered "beer is missing" to a request that sent it,
an optional one was neither coerced nor validated and came back from
`declared` as nil, and a Hash or Array scope named with a String was
reported missing.

`requires`, `optional`, `given`, the group rules and `declared_param?`
now keep a String name as a Symbol, which every params builder finds,
and `same_as:` does the same for the param it names. `given 'name'` also
finds a param declared as `:name`, and the reverse, where it raised
UnknownParameter under any builder.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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