Add Thumb guarded-load test fixture

[zardus]

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This adds a self-authored MIT ARM Thumb fixture for testing guarded-load conversion. The function uses complementary conditional loads that lift to VEX LoadG statements, giving a follow-up AIL regression a real input instead of a runtime-built container.

The ELF is built reproducibly from the included source with Clang and LLD. Its exact recipe, checksum, ABI, symbol, and layout are recorded beside the binary.

Validation: #181 (comment)

[zardus]

THIS MESSAGE WAS GENERATED BY AN AUTOMATED PROCESS

Validation record for head b300750352d41827de13d6afd143f1230c7966ea against baseline d35ea74667ba08d089085f841e92fe5e764124f6.

• Fixture: tests/armel/decompiler/loadg_ite_thumb.elf — SHA-256 1c75e244c948d983c81f93e2c268c286316882df0168856c8c26195c6a8a0d8a, 660 bytes, mode 0755
• Metadata: tests/armel/decompiler/loadg_ite_thumb.README.md — SHA-256 85ba27ad219cf17f1d8feaa1e6682f05980c534e4eecc38c25a2265a0322f102, mode 0644
• Source: tests_src/decompiler/loadg_ite_thumb.S — SHA-256 3d46531216a981261213f8edea48614981c16900528723a0b0c4ba4574fae051, mode 0644, SPDX MIT
• Reproducibility: documented Clang 21.1.8 and LLD 21.1.8 commands — two fresh builds produced identical objects and executables
• ELF audit: file, readelf, and Capstone — ELF32 little-endian ARM EABI5 soft-float; Thumb entry and symbol loadg_ite_mask; exact ITE EQ plus complementary loads; no relocations, dynamic section, debug paths, build ID, or timestamp
• Focused: python3 .agents/skills/angr-validate-workspace/scripts/check-test-inputs.py --repositories-root "$ANGR_REPOS_ROOT" --repository binaries — passed in the fixture-only feature shell
• Full suite: ./.agents/skills/angr-validate-workspace/scripts/run-all-tests.sh --jobs 1 — 16 skill paths and 21 links validated, 9 workspace tests passed, test-input policy passed, and all feature-instance scenarios passed in the fixture-only feature shell
• Lint/type: not applicable — no Python or workflow files changed

Caveats: binaries has no independent executable suite or pre-commit configuration; code-repository suites were skipped because this feature adopted only binaries.