Summary

• warn once when the holographic memory provider initializes without numpy, instead of silently degrading HRR-backed retrieval
• surface the same degraded state in hermes doctor when memory.provider: holographic is active
• add focused regression coverage for provider initialization and doctor diagnostics

Why

Fixes #17350. Without numpy, holographic memory still registers and stores facts, but semantic HRR behavior is disabled or downgraded: probe / related / reason fall back to keyword search, and contradict returns no results. Users had no visible signal that this was happening.

Testing

• ./.venv/bin/python -m pytest -o addopts='' tests/agent/test_memory_provider.py::TestPluginMemoryDiscovery::test_holographic_warns_when_numpy_missing tests/hermes_cli/test_doctor.py::TestDoctorMemoryProviderSection::test_holographic_provider_warns_when_numpy_missing -q
• ./.venv/bin/python -m pytest -o addopts='' tests/agent/test_memory_provider.py -q
• ./.venv/bin/python -m pytest -o addopts='' tests/hermes_cli/test_doctor.py -q
• ./.venv/bin/python -m py_compile plugins/memory/holographic/__init__.py hermes_cli/doctor.py tests/agent/test_memory_provider.py tests/hermes_cli/test_doctor.py

Note: running tests/agent/test_memory_provider.py tests/hermes_cli/test_doctor.py together still exposes an existing order-dependent failure in two Honcho doctor tests that monkeypatch plugins.memory.honcho after plugins.memory has already been imported. Each file passes independently.