Add parser coverage for --moe-a2a-backend=megamoe and local unit coverage for MegaMoE gating, GLM fast-path routing, fallback routing, and sidecar weight preservation.
Use monkeypatch-style tests so the forward and weight-layout checks do not require loading GLM 5.2 or importing a real deep_gemm runtime.
Constraint: tests must not stage or depend on local skill/doc artifacts.
Feature-flag: --moe-a2a-backend=megamoe.
Conflict-hotspots: test/registered/unit/server_args/test_server_args.py, test/registered/unit/moe/test_glm_megamoe.py.
Scope-risk: runtime GPU e2e still needs target Blackwell/DeepGEMM environment.
Tested: PYTHONPYCACHEPREFIX=/private/tmp/sglang_pycache python3 -m py_compile test/registered/unit/server_args/test_server_args.py test/registered/unit/moe/test_glm_megamoe.py.
Tested: git diff --check.
Not-tested: PYTHONPATH=python python3 -m pytest test/registered/unit/moe/test_glm_megamoe.py -q; local Python has no pytest.
Not-tested: PYTHONPATH=python python3 -m unittest test.registered.unit.moe.test_glm_megamoe -v; local Python has no torch.
Not-tested: GLM 5.2 MegaMoE GPU e2e; local environment lacks target runtime and hardware.
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