Add functional safety cutoffs and lid display sleep

[FarnoodF]

Summary

• Add functional safety controls for agent activity, internet reachability, Low Power Mode, battery floor, and auto-off behavior while keeping the existing Sleepless/cup branding.
• Harden the sudoers/install flow and split shared app behavior into focused Swift helpers.
• Add lid-close display sleep via the clamshell monitor and pmset displaysleepnow while keeping system sleep disabled.

Test plan

• ./build.sh in the functional split worktree.
• Checked IDE diagnostics for edited Swift files.
• Scanned the branch for Sleepless Agents/robot branding leakage.

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