bemanproject / execution / 22239888212

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rewrite sender-adaptor-closure infra (#220)

* execution: complete sender_adaptor_closure conformance and adaptor migration

- Refactor sender-adaptor closure infrastructure around sender_adaptor_closure, adaptor_closure, and composed closure piping.
- Migrate adaptor implementations (then, bulk, let, continues_on, associate, on, affine_on) to the closure-based path.
- Enforce [exec.adapt.obj] constraints and behavior: pipe equivalence, composition semantics, construction well-formedness, and noexcept propagation.
- Expand sender_adaptor_closure tests for uniqueness detection, composition associativity, composed call pattern, partial application well-formedness, and pipe parity.
- Deprecate direct detail::sender_adaptor alias in favor of make_sender_adaptor(...) factories and document the direct-use layout break (Adaptor moved into adaptor_closure_binding with [[no_unique_address]] for EBO, pending product_type support).
- Apply quality cleanup in sender_adaptor_closure module/header exports and comments.
- Add docs in headers.

* remove duplicate import and legacy sender_adaptor.hpp includes on affine_on.hpp

* rename is_sender_adaptor_closure_base to get_sender_adaptor_closure_base

* isolate operator| in detail::pipeable for ADL hygiene

Move the pipe operator overloads from beman::execution into
detail::pipeable so they are found only via ADL through the
closure_t base class. This prevents the operators from
participating in overload resolution for unrelated types in
beman::execution.

- Reintroduce beman::execution::detail::pipeable namespace.
- Add closure_t tag type as ADL anchor for sender_adaptor_closure
- Remove export using of operator| from execution.cppm
- Document detail::pipeable namespace in common.hpp

* explicit use sender_adapter_closure on execution-syn.test

* reexport operator| in execution.cppm to fix compilation issues with gcc/llvm presets

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