AOT: phpc build --project uses ProjectGraph PSR-4 discovery (#154)

[PurHur]

Summary

• Refactor: Extract PhpcBuild::resolveGraphIncludePaths() so phpc build --project and tests share one ProjectGraph include resolver (core wiring landed in AOT: phpc build --project uses ProjectGraph PSR-4 discovery (#1762) #3854 / AOT: Dynamic require/include discovery for project build (phase 2 of #154) #1762).
• Lint: phpc lint --project walks the same ProjectGraph::resolve() graph instead of ad-hoc PSR-4 directory scans.
• Test: Psr4StaticBuildProjectTest — dry-run / --list-units on test/fixtures/aot/projects/psr4_static discovers src/Greeter.php without manual includes[].

php-src reference

N/A (AOT linker / project graph). PSR-4 walk is analogous to the file set OPcache preload would load from a class map.

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
  vendor/bin/phpunit test/unit/Psr4StaticBuildProjectTest.php
  vendor/bin/phpunit test/unit/Psr4StaticAotExecuteTest.php
  vendor/bin/phpunit test/unit/ProjectGraphTest.php --filter Psr4
  ./phpc build --project test/fixtures/aot/projects/psr4_static --dry-run
'

Output:

OK (2 tests, 7 assertions)  # Psr4StaticBuildProjectTest
OK (1 test, 6 assertions)   # Psr4StaticAotExecuteTest (LLVM link+execute)

Closes #154

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