test(aot): add ltrim/rtrim PHPT for LLVM compile-and-run

[PurHur]

Summary

• Add test/fixtures/aot/cases/ltrim_rtrim.phpt exercising ltrim() / rtrim() with the default whitespace mask through bin/compile.php (LLVM AOT link + native run).
• Update docs/capabilities.md to record AOT PHPT coverage for both builtins.

Test output (Docker php-compiler:22.04-dev, LLVM 9 at /opt/llvm9)

docs/capabilities.md is up to date (105 builtins).
OK (41 tests, 46 assertions)   # test/aot/AotTest.php (was 40)
OK (2 tests, 16 assertions)    # test/aot/ExampleWebAotTest.php

Run locally:

./script/docker-ci-local.sh
# or subset:
tar -cf - --exclude='.git' --exclude='.llvm' . | docker run --rm -i -w /compiler \
  -e PHP_COMPILER_LLVM_PATH=/opt/llvm9 -e LD_LIBRARY_PATH=/opt/llvm9 \
  php-compiler:22.04-dev bash -c 'tar -xf - >/dev/null && script/apply-patches.sh >/dev/null && \
  php vendor/bin/phpunit test/aot/AotTest.php'

Test plan

• php script/capability-matrix.php --check
• phpunit test/aot/AotTest.php (41/41)
• phpunit test/aot/ExampleWebAotTest.php (2/2)

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