Consolidate logical and physical state in ItemSpec.

[azriel91]

Closes #69.

[codecov]

Codecov Report

Base: 91.66% // Head: 92.44% // Increases project coverage by +0.78% 🎉

Coverage data is based on head (cfd9d69) compared to base (7aa8861).
Patch coverage: 96.12% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   91.66%   92.44%   +0.78%     
==========================================
  Files         220      210      -10     
  Lines       13814    13534     -280     
==========================================
- Hits        12663    12512     -151     
+ Misses       1151     1022     -129     

Impacted Files	Coverage Δ
crate/cfg/src/state.rs	92.30% <ø> (ø)
crate/rt_model/src/item_spec_boxed.rs	100.00% <ø> (ø)
crate/rt_model/src/outcomes/item_ensure.rs	98.33% <ø> (ø)
crate/rt_model/src/outcomes/item_ensure_partial.rs	100.00% <ø> (ø)
item_specs/sh_cmd/src/sh_cmd_clean_op_spec.rs	65.57% <ø> (ø)
item_specs/sh_cmd/src/sh_cmd_item_spec.rs	94.11% <ø> (ø)
item_specs/tar_x/src/tar_x_item_spec.rs	92.30% <ø> (ø)
item_specs/tar_x/src/tar_x_clean_op_spec.rs	19.51% <33.33%> (-1.42%)	⬇️
crate/cfg/src/state/external.rs	44.44% <44.44%> (ø)
item_specs/tar_x/src/tar_x_ensure_op_spec.rs	74.66% <55.55%> (ø)
... and 42 more

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