Align the core pin with backend's nested agent-system-core pin
Why: check-pins failed on the follow-up CI: the newly pinned backend (741da4a) carries deps/agent-system-core at 0f94e4b while Dev's modules/core stayed at ba289e7 - the three-layer pin rule requires the top-level core pin to match. Evidence: 0f94e4b verified as an ancestor of Core origin/main; this PR's composite CI re-runs check-pins (GATE). Impact: modules/core gitlink to 0f94e4b; no source changes. Refs: check-pins failure on job 4204.
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