[WIP] Preserve UEFI firmware across hibernation in OpenHCL#3771

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mebersol wants to merge 16 commits into

microsoft:mainfrom

mebersol:user/mebersol/openhcl-hibernation-firmware

Commits on Jun 17, 2026

vmgs: rename FileId 14 to HIBERNATION_TOKEN, add FileId 19 HIBERNATION_FIRMWARE
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underhill_core: write hibernation power token on power off
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underhill_core: decide hibernation firmware-stored flag at boot
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openhcl: snapshot pristine UEFI firmware to VMGS for hibernation (Phase 1)
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openhcl: restore UEFI firmware from VMGS on hibernation resume (Phase 3)
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openhcl: rename hibernation firmware helpers and move threshold const
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vmgs: add delete_file to broker; delete hibernation token on resume
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openhcl: gate firmware storage on VMGS capacity and refine resume detection
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openhcl: rename hibernation_token to power_token
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openhcl: rename power_token to hibernate_token
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openhcl: set hibernation_firmware_stored from actual outcome
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openhcl: restore required 32MB VMGS minimum-size gate
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openhcl: log info on hibernation resume, warn on insufficient VMGS space
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openhcl: warn (not error) when no firmware image stored to restore on resume
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openhcl: only clear hibernate token on power off/reset when hibernation enabled
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openhcl: gate firmware restore on hibernate token, always clear token on resume
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