Conform Hash to Enumerable of key/value pairs, not just values

[apiology]

Problem: URI.encode_www_form takes Enumerable[[_ToS, _ToS]] per RBS core. Solargraph's strict typecheck rejects a real Hash literal there anyway, in code that's run correctly for years:

test/unit/sources/test_airnow.rb:18: Wrong argument type for URI.encode_www_form: enum expected Enumerable<Array(_ToS, _ToS)>, received Hash{Symbol => Float, String, Integer}

body: URI.encode_www_form(latitude: 38.8857022, longitude: -77.0937858, stateCode: 'VA', maxDistance: 50)

Confirmed directly: URI.encode_www_form(token: 'abc', user: 'x') returns "token=abc&user=x" at runtime -- a Hash always satisfies this contract.

Cause: ComplexType::Conformance#conforms_to_unique_type? checks Hash<K,V> against Enumerable<Array(_ToS,_ToS)> by comparing V alone against the expected tuple type, instead of reshaping the hash into [K,V] pairs first:

# @param h [Hash{Symbol => Object}]
URI.encode_www_form(h)              # passes: Object matches leniently
# @param h [Hash{Symbol => Array<String>}]
URI.encode_www_form(h)              # passes: Array structurally matches the outer shape
# @param h [Hash{Symbol => String}]
URI.encode_www_form(h)              # fails: String matches neither escape hatch
URI.encode_www_form(a: 1.0, b: '2') # fails: mixed value types match neither

Solution: Conformance#pair_shaped_viewed_as_pairs? detects when inferred has 2+ ordered generic params being checked against a different-arity ancestor in TUPLE_YIELDING_ANCESTOR_NAMES (Enumerable, _Each) -- the convention for "all of my own params yielded together as one tuple," per Hash's own core signature include Enumerable[[K, V]]. pair_shaped_as_pairs then reshapes inferred into that ancestor parametrized with the tuple its params form, and conformance is re-checked against that.

This PR was written by Claude Code on behalf of @apiology.