engine: a call through a memoize/once wrapper (memoize(() => require('./X'))()) resolves to nothing, because the wrapper's parameter merges every caller and is fan-capped #695

Found on the development corpus (webpack at main after #694: 16 getCompilationHooks MISSED sites in lib/ModuleTemplate.js, lib/MainTemplate.js, lib/ChunkTemplate.js, plus lib/config/target.js:19 and lib/util/serialization.js:41, all through lib/util/memoize.js; 24 files define a getter with it).

const memoize = fn => {
  let cache = false, result = undefined;
  return () => { if (cache) return result; result = fn(); cache = true; fn = undefined; return result; };
};
const getJavascriptModulesPlugin = memoize(() => require("./javascript/JavascriptModulesPlugin"));
getJavascriptModulesPlugin().getCompilationHooks(compilation);   // MISSED: ambient_terminal (result holds only undefined)

The call getJavascriptModulesPlugin() resolves to the inner arrow (known_edge). Its result is result, assigned from fn(), and fn is memoize's parameter, which context-insensitively holds every function ever passed to memoize (60 across webpack). That fan is over the dispatch cap, so fn() is fan_capped, result holds only its undefined initializer, and the getter's call is an ambient terminal. Without the cap it would be a 60-wide superset. Case 38-style probe with one memoize call resolves fine (the fan is 1), so the suite does not see it.

This is the "utility that merges its callers" item of #465, in its most common concrete form: a wrapper whose returned closure's result is the result of calling one of the wrapper's parameters. A per-call-site summary would fix it exactly: when a function h returns a closure c, and c's return value is p() for a parameter p of h (possibly through a variable), then at a site h(g) the site's value is a closure whose call returns what g returns. Representing that needs a value identity per (closure, site), for instance ("func", c) paired with a site-specific return: call_result_of_wrapped(site, k, i) fed into the value of any call whose callee value came from that site's result. once, lazy, debounce-style wrappers are the same shape.

Regression: a case with two memoized getters of different modules called from one file, each resolving to its own module's member and not the other's; webpack MISSED before and after.