fix(deps): publish the 0.203 line on agent-core 0.10.2 (0.203.4)

v0.203.3 (#970) did not publish. Its packed-consumer check found two agent-interface copies, because agent-core 0.10.3 (2026-10-06) moved to agent-interface 3 in a patch release, and the 0.203 line's `^0.10.2` now resolves it beside the consumer's interface 2.