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Perform an early validation check on both container checkpoint and restore paths to fail-fast if the CRIU binary is missing or is older than the minimum required version (3.16.0). To support runtime-configured environments, the validation respects the custom PATH from the shim manager environment if configured, skipping any relative paths to avoid incorrect daemon-relative resolution. If not configured, it falls back to a standard system PATH lookup. The check result is cached using sync.Once to prevent redundant process spawning. Assisted-by: Antigravity Signed-off-by: Samuel Karp <samuelkarp@google.com>