steve-downey / callcc / 28718832322

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Add value_escape, call_cc_void, call_cc_from, and escape_fn alias

Extend the call_cc API with three new entry points and a value-channel
escape variant:

- value_escape_sender: completes set_value_t(V) instead of set_stopped_t(),
  making escape composable as a when_all child.
- escape.value(v): factory method producing value_escape_sender.
- call_cc_void(f): convenience for monostate early exit (no return value).
- call_cc_from(f): deduces ValueType from a typed escape_fn<V> parameter.
- escape_fn<V>: public alias for the escape factory type.
- stop_forwarder: replaces std::function<void()> in the stop callback,
  eliminating the last potential heap allocation.

Includes six new Catch2 tests and two example programs
(callcc_when_all.cpp, callcc_void_escape.cpp).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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