v0.21.3 — cross-host comms (stage1 + stage2)

What's Changed

• release: v0.17.2 — channel push fix + node-comms e2e + audit-gate green by @ywatanabe1989 in #136
• release: v0.17.3 — channel push fixes (capability + requires_reply meta-string) by @ywatanabe1989 in #137
• release: sync main with develop by @github-actions[bot] in #138
• release: v0.18.0 by @ywatanabe1989 in #162
• release: v0.18.0 (retry) by @ywatanabe1989 in #164
• release: scitex-agent-container v0.19.0 by @ywatanabe1989 in #199
• release: v0.20.0 — per-agent OAuth account assignment by @ywatanabe1989 in #202
• release: v0.21.0 — provider override (#208) + §6 exemption (#209) by @ywatanabe1989 in #212
• fix(ssh): add ControlMaster multiplexing for parallel SSH to Spartan by @ywatanabe1989 in #217
• chore: back-merge main into develop (-s ours) by @ywatanabe1989 in #235
• release: sync main with develop by @github-actions[bot] in #222
• feat(comms): stage1 — symmetric federated comms_nodes (cross-host A2A registry) by @ywatanabe1989 in #234
• feat(comms): stage2 — cross-host push via ssh-transport selector + ACL e2e by @ywatanabe1989 in #236
• release: bump to v0.21.3 by @ywatanabe1989 in #237

New Contributors

• @github-actions[bot] made their first contribution in #138

Full Changelog: v0.21.2...v0.21.3