a2a: add async dispatch (a2a_send_async / check_task / cancel_task) — replaces #1066#1221

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pbranchu:a2a-async-dispatch

Commits on May 31, 2026

kernel: thread channel callback context through agent loop

Philippe Branchu
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claude
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fix(deps): upgrade lettre to 0.11.22 (RUSTSEC-2026-0141)

Philippe Branchu
and
claude
committed
a2a: switch synchronous a2a_send to SSE streaming

Philippe Branchu
and
claude
committed
a2a: add async dispatch (a2a_send_async / check_task / cancel_task)

Philippe Branchu
and
claude
committed
fix(test): avoid Instant arithmetic in test_completed_entries_swept_after_grace (Windows panic)

Philippe Branchu
and
claude
committed