chore(ci): reuse cargo commands via composite actions

[RAprogramm]

Summary

• add composite GitHub Actions for cargo fmt, clippy, test, and audit workflows
• update the reusable CI pipeline to invoke the new composites after shared setup
• document the composites in the docs wiki so other workflows can reuse them

Testing

• not run (ci configuration change only)

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https://chatgpt.com/codex/tasks/task_e_68db4d438b4c832bbefcb655b9e7ec3d

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P0] Fix indentation on Auto-commit README step

The new workflow block after the composite actions has - name: Auto-commit README changes (any branch) followed by if: and run: at the same indentation level. In YAML the keys that belong to the step must be indented deeper than the dash; as written, if and run are parsed outside of the step and the workflow fails to load (unexpected key while parsing steps). The pre-existing version used correct indentation. Re‑indent if: and run: (and their bodies) so they are children of the list item.

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