introduce engine.Cont to declutter

[ichiban]

No description provided.

[codecov]

Codecov Report

Base: 99.06% // Head: 99.06% // No change to project coverage 👍

Coverage data is based on head (a09c1cb) compared to base (9d7038b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #266   +/-   ##
=======================================
  Coverage   99.06%   99.06%           
=======================================
  Files          22       22           
  Lines        7148     7148           
=======================================
  Hits         7081     7081           
  Misses         50       50           
  Partials       17       17           

Impacted Files	Coverage Δ
cmd/1pl/interpreter.go	100.00% <100.00%> (ø)
engine/builtin.go	99.08% <100.00%> (ø)
engine/clause.go	98.40% <100.00%> (ø)
engine/dcg.go	100.00% <100.00%> (ø)
engine/number.go	100.00% <100.00%> (ø)
engine/text.go	100.00% <100.00%> (ø)
engine/vm.go	88.36% <100.00%> (ø)

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