Add nvidia-aer-correctable and pcie-aer-correctable patterns to catch
"bus correctable error" events seen in SEL (Critical Interrupt / offset 7).
Both patterns carry severity "warning" — correctable errors are
hardware-recovered and should not flag a card as failed.
Fix kmsg_watcher routing: GPU-category events were keyed as pcie:<BDF>
but the UI queries for pcie:gpu: prefix. Split the switch so "gpu" →
pcie:gpu:<BDF> and "pcie" → pcie:<BDF>. This applies to both
flushWindow (SAT-window path) and flushImmediate (always-on path).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
805a3b277d