chore: release 0.8.12

[github-actions]

🚀 Release ${version}

0.8.12 (2026-06-21)

Features

• cli: make cache list per-InferenceService cache aware (#731) (#767) (d03c9ee)
• foreman: codegen-drift check in the coder fast gate (#775) (#778) (b04a28d)
• metal-agent: event-driven endpoint withdrawal/recovery on health transitions (#662) (#771) (7848d18)
• metrics: TTFT histogram, request error counter, vLLM metrics flag (#409) (#769) (563b0c9)

Bug Fixes

• controller: make checkAcceleratorAvailability DRA-aware (#754) (#776) (804063b)
• controller: preserve agent-written schedulingStatus on reconcile (#643) (#774) (4321028)
• controller: reconcileService updates existing Service on endpoint changes (#720) (#773) (70222ae)
• metal-agent: clear SchedulingStatus on memory-check-pass (#777) (#779) (ed1c4eb)
• metal-agent: prevent zero-byte stub files from failed model downloads (#642) (#772) (d737e47)

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