Add dmosi_process_get_parent interface

[Copilot]

dmosi_process_create() accepted a parent parameter but there was no way to retrieve it afterward — unlike every other process property which has a corresponding getter.

Changes

• include/dmosi.h — Adds _process_get_parent declaration to the Process API group
• src/dmosi.c — Adds weak stub returning NULL, consistent with all other weak stubs

Usage

dmosi_process_t child = dmosi_process_create("child", "my_module", parent_proc);

// Previously impossible:
dmosi_process_t parent = dmosi_process_get_parent(child);

Original prompt

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This section details on the original issue you should resolve

<issue_title>Brakuje interfejsu do pobrania parenta procesu</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Brakuje interfejsu do pobrania parenta procesu #17

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