[Rafael-SOWNet]

erf, erfc, erfi, Si, Ci, Shi, Chi, Ei and li had no limit at all: even
erf(x) at +oo, which is 1, and erf(x) at 1 were left unevaluated, on
master and on 2.6.0.

At an infinity each now gives its known value (erf to +-1, erfc to 0 and
2, Si to +-pi/2, Ci to 0, Ei to +oo and 0; erfi, Shi, Chi and li to
+-oo), each checked with mpmath at +-10^6, or +-50 for erfi, Shi and Chi.
At a finite point the limit is the function of the argument's limit,
kept exact. erf, erfc, erfi, Si and Shi are entire, so any finite point
is accepted; Ci, Chi, Ei and li are singular at 0 and cut below it, so
only a positive real point is, and li also excludes 1. Nothing is
claimed on a cut.

The limitcheck A/B over 24 seeds decides 30 to 290 more limits per seed,
with no value lost. The new two-sided NaNs are 0^0 forms such as
erf(x)^x at 0, which follow the x^x convention; their one-sided limits
are right. 16 of the 19 new test rows fail on master.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.76%. Comparing base (eda9e03) to head (1423305).

Files with missing lines	Patch %	Lines
...nctions/Continuous/Limits/Solvers/Limit.Classes.cs	71.42%	7 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2373      +/-   ##
==========================================
- Coverage   86.76%   86.76%   -0.01%     
==========================================
  Files         312      312              
  Lines       68911    68953      +42     
  Branches    20082    20096      +14     
==========================================
+ Hits        59792    59828      +36     
  Misses       4921     4921              
- Partials     4198     4204       +6     

Flag	Coverage Δ
cpp	37.77% <ø> (ø)
csharp	87.30% <71.42%> (-0.01%)	⬇️
fsharp	32.97% <ø> (ø)
interactive	40.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...nctions/Continuous/Limits/Solvers/Limit.Classes.cs	74.41% <71.42%> (-0.43%)	⬇️

... and 6 files with indirect coverage changes

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