docs(tvix/TODO): castore Directory struct is done r/8487

There's some followup work on making tvix-build use the stricter structs
natively, but that should probably be combined with the overall trait
changes there.

Add an item there so we won't forget, but this isn't really castore
territory anymore.

Change-Id: I6b1f9fa02d5c87c821d4ddc4b1dcc6a98c4eeaa5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12200
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: yuka <yuka@yuka.dev>
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>

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