chore: log AUR exit-0 fix verification and close the sub-task

Two updates in todo.org. I marked the two dconf entries in the `[#B] Fix install errors` parent body as RESOLVED in `762caef`, since the system-wide dconf db migration verified clean in last night's VM run.

I converted the `*** TODO [#B] AUR exit-0 logged as error` sub-task into a dated event-log entry. The root cause was a bash if-compound semantics trap in `retry_install` (the if-compound exits 0 when no condition tested true, overwriting the eval's actual exit code that `last_exit_code=$?` was trying to capture). Today's VM run verified the fix: `mkinitcpio-firmware` and `tidaler` now report `error code: 1` instead of the misleading `error code: 0`.

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