Add C and Common Lisp base kernels with a Rust comparison

[MrJ-am]

Series: base #1084, wheel #1085, other #1082.

This is the base part of a three-category C/Rust/Common Lisp comparison. It preserves odd-candidate scanning and source-level individual marking, following the accepted dense/sparse approach in Rust solution 1.

Adds C solution 6 and Common Lisp solution 4. Constant address carries remove sparse-loop indexing work; the Lisp dense generator uses single-assignment bindings so stock SBCL can fold the individual bit operations. Both entries allocate fresh state for every pass. Rust solution 1 is retained unchanged because the attempted changes did not establish a stable gain.

These separate entries keep the direct C kernels independent of the existing C tuning infrastructure and isolate the native-memory, SBCL 2.6.8 implementation from the existing Lisp runtime requirements. The series reserves Lisp 3 for the existing other PR and Lisp 5 for wheel.

On one logical CPU of an AMD EPYC 9V74, four five-second samples at limit 1,000,000 gave these medians:

Language	Reference	Retained entry	Passes/s
C	solution 5: 4,041	solution 6	13,815
Lisp	solution 2 dense: 3,331	solution 4	10,139
Rust	unchanged solution 1	unrolled	14,219

The C/Rust gap is small relative to the observed spread. Commands, raw measurements and limits are included.

Native validation passed: independent full-flag checks, memory guards, 10M counts, and ASan/UBSan for C (leak detection unavailable under container tracing). Dockerfiles are included but Docker was unavailable locally. Submitted as a draft pending container/CI review. Development and source inspirations are credited in the READMEs.