Redesign descent

[HoshinoTented]

Fix #1440 , maybe also #1436 but I don't know how to do.

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.64%. Comparing base (5429129) to head (4ad204c).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
...se/src/main/java/org/aya/unify/TermComparator.java	25.00%	3 Missing ⚠️
...ase/src/main/java/org/aya/normalize/Finalizer.java	81.81%	2 Missing ⚠️
base/src/main/java/org/aya/terck/CallResolver.java	92.85%	1 Missing ⚠️
base/src/main/java/org/aya/tyck/ExprTycker.java	80.00%	0 Missing and 1 partial ⚠️
...tax/src/main/java/org/aya/generic/TermVisitor.java	75.00%	1 Missing ⚠️
...x/src/main/java/org/aya/prettier/CorePrettier.java	0.00%	0 Missing and 1 partial ⚠️
.../src/main/java/org/aya/syntax/ref/SeqLocalCtx.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1443      +/-   ##
============================================
- Coverage     82.69%   82.64%   -0.05%     
+ Complexity     4541     4538       -3     
============================================
  Files           393      394       +1     
  Lines         13487    13480       -7     
  Branches       1654     1653       -1     
============================================
- Hits          11153    11141      -12     
- Misses         1471     1476       +5     
  Partials        863      863              

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