Merge configCosmosKernel.h into configCosmos.h

[ejpilger]

With the repo split into thirdparty, kernel, micro-agent, simulator, agent, and ground-station, the distinction between configCosmos.h and configCosmosKernel.h is no longer meaningful.

Current situation:

• configCosmosKernel.h — platform detection, standard C++ headers, STL types, using declarations
• configCosmos.h — includes configCosmosKernel.h, then adds mutex/thread/condition_variable, OS-specific socket/network headers, and json11.hpp

Why the distinction is now redundant:

• json11.hpp is on the include path via the thirdparty repo — no need to pull it in through a config header
• Socket/network headers are included directly by socketlib.h in the micro-agent repo
• Threading headers (<thread>, <mutex>) can be included by the individual files that need them
• The repo boundary itself enforces what is available at each layer — that was the original purpose of having two config headers

Fix:

1. Merge the content of configCosmosKernel.h into configCosmos.h (keep the kernel content, drop the now-redundant additions)
2. Update all #include "support/configCosmosKernel.h" references to #include "support/configCosmos.h" across all repos
3. Remove configCosmosKernel.h

Scope: All six repos (thirdparty, kernel, micro-agent, simulator, agent, ground-station) and core.