fix(weaving): copy the imports of the namespace block declaring the woven class

[lisachenko]

What and why

This bug fix comes from the declined #757 (#749). It has nothing to do with the AST cache limit.

The bug: a file may declare the same namespace in several blocks, each with its own imports:

namespace Test\ns1 {
    use Go\Stubs\Collision\Interceptor as Level;
    class FirstBlockClass {}
}

namespace Test\ns1 {
    use Go\Stubs\Collision\The as Level;
    class SecondBlockClass {
        public function log(string $level = Level::LEVEL): string { return $level; }
    }
}

WeavingTransformer::processSingleClass() looked the imports up again with new ReflectionFileNamespace($file, $namespaceName), which returns the first block of that name. The proxy of SecondBlockClass therefore got use Go\Stubs\Collision\Interceptor as Level;, and the copied parameter default Level::LEVEL referred to the wrong class.

The fix: processSingleClass() now receives the ReflectionFileNamespace being woven from transform() and reads the imports from it. As a side effect, this removes the second namespace lookup per woven class, along with its getFileName() guard, which nothing else in the method used.

Tests

• New WeavingTransformerTest::testProxyCopiesImportsOfTheNamespaceBlockDeclaringTheClass with fixture _files/duplicate-ns.php. It asserts that the proxy imports The as Level, contains no Interceptor import, keeps the Level::LEVEL default, and compiles.
• Checked both ways: the test fails with master's src/ and passes with the fix.
• Gates, run locally:
  • full phpunit (3089 tests), phpstan level 10 and php-cs-fixer are green;
  • the transformation performance group is within budget, and the weaving ratio of 0.25 is unchanged from master.

Checklist

• The title follows Conventional Commits (type(scope): summary)
• Tests cover the change
• composer check passes
• User-facing or breaking changes are in CHANGELOG.md (and the upgrade guide for breaking changes)

🤖 Generated with Claude Code

https://claude.ai/code/session_01KXjD75egSqDNujmNS5kr5c

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.63%. Comparing base (79ec2a5) to head (8d26964).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #758      +/-   ##
============================================
+ Coverage     97.61%   97.63%   +0.01%     
+ Complexity     1830     1829       -1     
============================================
  Files           104      104              
  Lines          4831     4829       -2     
============================================
- Hits           4716     4715       -1     
+ Misses          115      114       -1     

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