docs(window-switcher): focusHistoryID is not on HyprlandToplevel

Implementing the model found it. The property reads undefined, so the
planned sort compared NaN and silently did nothing, leaving the list in
arbitrary tracker order while looking entirely plausible. It is on
lastIpcObject instead.

Carried into the plan's later tasks so the grid does not reintroduce the
bare property, and into the notes that Task 6 puts in AGENTS.md, since a
sort that quietly does nothing is the kind of wrong answer this repo's
notes exist to prevent.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SYg4wYHq5XNbiVmMeKRb1S

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