Auditors can now send BIOS/Redfish platform settings via
POST /ingest/hardware as hardware.platform_config (map[string]any).
Stored as latest-snapshot per machine with per-key change history.
Exposed via GET /api/assets/{id}/platform-config and .../history.
Asset page gets a third tab "Platform Config" with inline history expand.
Contract bumped to v2.9, migration 0024 adds two new tables.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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