docs(explore-notes): report Phase 2a virtualization+drag gate spike
Headless Avalonia ListBox+VirtualizingStackPanel spike answers all five questions from the Phase 2a gate task: containers stay bounded at 1000 items, the existing InputHitTest ghost-drag model survives recycling, variable row heights don't drift the Extent (only naive index*height math would), auto-scroll via Offset mutation is mechanically feasible, and mixed header/task rows template correctly via implicit DataTemplates. Recommendation: proceed to Phase 2b. Spike code itself is throwaway and not checked in.
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@@ -20,6 +20,7 @@ These sit **between** the CLAUDE.md files and the code:
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| [review-merge](review-merge.md) | Approve=merge-unit, verify gate, `MergeCommit`/revert, diff stack, conflict resolver |
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| [conpty-sessions](conpty-sessions.md) | Interactive/planning/list-handler launch specs + the arg-flattening gotcha |
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| [installer-preflight](installer-preflight.md) | CLI version/login/auto-mode research, the `ExecutableResolver`/shim root cause, and the Installer's `Checks/`+`SystemCheckPage` implementation status |
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| [list-virtualization-spike](list-virtualization-spike.md) | Phase 2a gate spike: virtualized `ListBox` + the existing ghost-drag `InputHitTest` model, verified headless |
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## Rules
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