chore: reconcile task facts, consolidate CI + security clusters

I audited the open-work tasks for factual accuracy. Reconciled stale facts against the code and git state: dropped the "hardcoded repo URLs" item (the dotfiles repo is config-driven now), corrected the commit count to 589, and noted that the 2026-06-28 btrfs/zfs runs reproduce the same residual install warnings. Cancelled the calendar-URL rotation (Craig's call, exposure window recorded) and refiled the dotfiles-audit task to the standalone dotfiles repo. Closed the README as code-complete with the final read filed under manual testing. Grouped 14 scattered CI/test tasks under a "Test + CI infrastructure" parent and 5 security tasks under "Security hardening + audit", each child keeping its prior priority. Fixed two terminology drifts (container to VM, DWM to Hyprland).

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