Agent Instance 0.22.4

Instance 0.22.4

External context_read now forwards an explicitly supplied nonnegative integer
before position to the selected conversation source. Supporting sources return
source.next_cursor for the caller's next request in the same conversation and
thread. Each page retains existing access checks, source attribution and coverage.
Paging remains caller-driven, and unsupported continuation errors stay visible.

Native history behavior, Runtime 0.15.6 and dependency pins are unchanged. See
external conversation continuation
for the optional source contract and its limits.

Packages are the unchanged six-platform CI artifacts from reviewed source 68e58ebc2df128a8d3b5b3c43c28151418cda8ee; the release commit has the identical tree.