feat(tee): implement TPM, SEV-SNP, TDX, and Opaque provider stubs - #127
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Adds TPMProvider (tpm2-pytss + subprocess fallback), SEVSNPProvider (ioctl SNP_GET_REPORT), TDXProvider (ioctl TDX_CMD_GET_REPORT0), and OpaqueProvider (not-yet-implemented stub). All detect() methods return False gracefully on non-Linux or missing hardware. 19 unit tests added. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
TPMProvider(tpm2-pytss ESAPI with subprocesstpm2_pcrreadfallback), measuring PCRs 0-7 via SHA-256 (SHA-1 fallback withmeasurement_note) and emitting a TPM2_Quote asraw_evidenceSEVSNPProvider(LinuxioctlSNP_GET_REPORT on/dev/sev-guest), extracting the 48-byte measurement field at offset 0x60 in the SNP reportTDXProvider(LinuxioctlTDX_CMD_GET_REPORT0 on/dev/tdx_guest), extracting the MRTD field at offset 0x90 in the TDREPORTOpaqueProviderstub (detect always False, get_attestation_report raises NotImplementedError)detect()methods return False gracefully on non-Linux, missing devices, or import errors — never raisetests/unit/test_tee_providers.py; mypy strict passesTest plan
python -m pytest tests/unit/test_tee_providers.py -q— 19 passedpython -m mypy src/cmcp_gateway/tee/— no issues in 7 source filesCloses #83, Closes #89, Closes #93
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