#319 #328 #329 Fix null-class continue, culture typo, and MappaContext docs

[sanelli]

Summary

• #319: skip null class declarations with continue so remaining mappers still generate; add unit harness regression test.
• #329: fix GeyCultureInfo → GetCultureInfo in parse helper exception messages and matching tests.
• #328: document that MappaContext is not thread-safe (XML docs, README, attributes, tutorial).
• Bump to 10.2.0-alpha.62. Also clarify workflow rule that any dotnet command needs network/proxy handling.

Test plan

• .\Scripts\RunTestsAndReportCoverage.ps1 (2955 tests passed)
• Coverage ≥ baseline (line 98.4%, branch 90.9%, method 100%)
• CI green on PR

Closes #319
Closes #328
Closes #329

[github-actions]

Code coverage

Compared against the latest published coverage history from the code coverage gist.

Metric	Baseline	PR	Δ	Trend
Line	98.4%	98.4%	0	=
Branch	90.8%	90.9%	+0.1	▲
Method	100%	100%	0	=

No coverage metric dropped by more than 1 percentage point(s) versus baseline.

Benchmarks

Winners (chart subset)

Benchmark	Best time	Best memory
Array To List	Mapperly (-8%)	Mapperly, Mappa
List To Array	Mapperly (-2.9%)	Mapperly, Mappa
Fast List To Array	Mapperly (-3.4%)	Mapperly, Mappa
Dictionary	Mapperly (-23.4%)	Mapperly (-32%)
Objects mapping	Mapperly (-3.2%)	Mapperly (-5.4%)
IQueryable Projection	Mapster (-1.1%)	Mapster (-2.8%)
String To Enum	Mappa	n/a
Enum To String	Mapperly (-7.2%)	n/a
Reference Reusing	Mappa	Automapper (-17.3%)

AutoMapper is the BenchmarkDotNet ratio baseline. Absolute values are mean time in nanoseconds and allocated bytes. Ratio columns are competitor / Mappa as a percentage (n/a when either side is missing or Mappa is zero).

Benchmark	Automapper Mean (ns)	Automapper Allocated (B)	Mapster Mean (ns)	Mapster Allocated (B)	Mapperly Mean (ns)	Mapperly Allocated (B)	Mappa Mean (ns)	Mappa Allocated (B)	Automapper/Mappa Time	Automapper/Mappa Alloc	Mapperly/Mappa Time	Mapperly/Mappa Alloc	Mapster/Mappa Time	Mapster/Mappa Alloc
ArrayToListBenchmark	368310	592056.32	316430	648058.88	24580	128051.2	26730	128051.2	1377.9%	462.4%	92%	100%	1183.8%	506.1%
DictionaryBenchmark	387980	615014.4	361850	742277.12	35780	151019.52	46710	222218.24	830.6%	276.8%	76.6%	68%	774.7%	334%
EnumToStringBenchmark	69.132	24	20.092	24	0.684	0	0.737	0	9380.2%	n/a	92.8%	n/a	2726.2%	n/a
FastListToArrayBenchmark	376850	592025.6	319450	648028.16	26460	128020.48	27400	128020.48	1375.4%	462.4%	96.6%	100%	1165.9%	506.2%
IQueryableProjectionBenchmark	643800	68034.56	620700	67266.56	631200	69201.92	627300	69201.92	102.6%	98.3%	100.6%	100%	98.9%	97.2%
ListToArrayBenchmark	375050	592025.6	314490	648028.16	24860	128020.48	25600	128020.48	1465%	462.4%	97.1%	100%	1228.5%	506.2%
NestedDtoBenchmark	416520	742809.6	374230	789555.2	39470	149401.6	40760	157900.8	1021.9%	470.4%	96.8%	94.6%	918.1%	500%
ReferenceReusingSharedDagBenchmark	322.3	344	196.5	400	309.3	800	108.6	416	296.8%	82.7%	284.8%	192.3%	180.9%	96.2%
StringToEnumBenchmark	57.153	0	91.547	216	3.606	0	3.548	0	1610.9%	n/a	101.6%	n/a	2580.2%	n/a