Non-data-owned Initializer for `ConnectionBuffer` Should Take a `const`-qualified Pointer

The non-data-owned initializer for `ConnectionBuffer`, `Init(uint8_t *aData, const size_t &aCapacity)`, should take a `const`-qualified `aData` pointer.

In addition, attempts to use `Put` on such a buffer should fail.

Locate the ConnectionBuffer definition and the non-data-owned Init(uint8_t *aData, const size_t &aCapacity) entry point, then inspect how Put is exposed for that buffer type. Confirm the intended const-qualified pointer behavior and identify the existing tests or build checks covering initialization and Put; done means the API prevents Put on such buffers and the relevant checks pass.

Written by the indexing model from the issue text.