Collapse ExpressionResolver member lookup to one helper

[Firehed]

Retargets step-24 to the structural M×N only — the "late-binding on properties as it does for methods" clause was unsatisfiable (PHP forbids static as a property type), so the row now covers the four near-identical resolvers only.

Done

• The four methods share one member-lookup helper — ExpressionResolver::resolveMember owns the receiver → ClassName dance (Name via ScopeFinder::resolveClassNameInContext, expression via resolve()->getType()->getResolvableClassNames()), and each caller passes a first-class kind-specific finder (findMethod(...) / findProperty(...)).
• Adding a fifth member-access node kind is one call site, not four — a new resolver is one guard, one resolveMember call, and one small find* finder (or reuse of an existing one).
• Existing hover, definition, completion, and signature-help suites remain green — composer test passes locally.

Tightening

Locked in the boundary the refactor establishes:

• Folded docblockForExpression's method/property branches and resolveConstructor through resolveMember too, so the file's two private find* finders are the sole direct callers of MemberResolver::findMethod/findProperty.
• Added a disallowedMethodCalls entry in phpstan.neon for MemberResolver::findMethod() and MemberResolver::findProperty(), allowed only in src/Resolution/ExpressionResolver.php (plus MemberResolver.php itself for its trait-alias self-calls, and tests). A future sibling resolve* that reaches for MemberResolver::findMethod directly instead of going through resolveMember now fails PHPStan.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.35%. Comparing base (80e706c) to head (179800f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #478      +/-   ##
============================================
- Coverage     99.40%   99.35%   -0.05%     
+ Complexity     1875     1873       -2     
============================================
  Files           132      132              
  Lines          4838     4805      -33     
============================================
- Hits           4809     4774      -35     
- Misses           29       31       +2     

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[Firehed]

All changed lines covered, project coverage drop not relevant.