RiftLift 0.9.0 alpha 5

Alpha 5 makes RiftLift doctor substantially more useful and trustworthy. RiftLift now saves private, bounded per-launch logs; includes launch and optional Proton error excerpts in diagnostic reports; preserves launch start and finish times; correlates journal evidence with actual RiftLift launches instead of unrelated Steam OpenXR probes; and recommends concrete next steps. Log retention is capped at ten 4 MiB launch logs and three 8 MiB Proton logs. The native compatibility and XRizer payloads are unchanged from alpha 4 and are republished byte-for-byte for a self-contained release.