Note supported Debian distros for os_auto_upgrade_type

[shannonbradshaw]

Source changes

• RSDK-13484: Add trixie to list of debian versions supporting unattended upgrades agent#233 (commit 1a81dd3): Added Debian Trixie to supported distros for unattended upgrades

Docs changes

• docs/reference/viam-agent.md: Added note that automatic OS package updates require Debian Bullseye, Bookworm, or Trixie, and that unsupported distributions log a warning
• docs/fleet/system-settings.md: Added the same note after the os_auto_upgrade_type options table

How I found these

• Backlog item agent-1a81dd3-trixie-support from 2026-05-05 run
• Code reference: agent/subsystems/syscfg/upgrades_linux.go line 25 defines supportedCodenames and line 89-103 implements checkSupportedDistro() which returns an error on unsupported distributions

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[viamrobotics-overwatch]

Hey @shannonbradshaw — CI is green and no reviewer is assigned yet. Could you request one when you have a chance?

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