[jBernavaPrah]

The independent ring-bound test cleared the observation buffer owned by generated-runtime diary tests without taking their fixture lock.
A concurrent clear after reset's accepted invocation erased its recorded empty-ring observation and made the unchanged reset assertion report the fallback count of one.

Remove the unused shared-buffer clear from the local ring exercise.
Run that same exercise between the real generated owner's reset invocation and its observation assertion to protect this interference boundary deterministically.
Production diary behavior, bounds, reset semantics and suite scheduling remain unchanged.

Validation:

• Preserved original CI failure and reproduced the same expected-0/observed-1 failure by deliberately interleaving the actual ring test at the reset assertion boundary.
• Parallel SDK unit surface: 115 passed, zero ignored.
• Isolated observer target: 4 passed, zero ignored.
• Strict Clippy for both targets, formatting and whitespace checks passed.