v2026.3.13.0

What's Changed

• feat: runtime HTTP/WS backend selection + Lark binary protobuf protocol by @mccoysc in #48
• fix: add periodic protobuf ping loop for Lark WebSocket event delivery by @mccoysc in #49
• fix: reset is_processing on error + capture curl stderr for diagnostics by @mccoysc in #50
• fix: drain stderr before wait() to avoid deadlock + reset is_processing on hook early returns by @mccoysc in #51
• fix: use curl -sS to show errors on stderr for streaming diagnostics by @mccoysc in #52
• feat: native HTTP streaming support for --http-backend native flag by @mccoysc in #53
• Upstream sync by @mccoysc in #55
• fix: fall back to curl when timeout_secs is set in native streaming dispatch by @mccoysc in #54
• Upstream sync by @mccoysc in #56
• fix: double-free of enriched message on provider error in Agent.turn() by @mccoysc in #57
• Upstream sync by @mccoysc in #58
• fix: suppress error-level logs in tests that cause Zig test runner failures by @mccoysc in #59
• Upstream sync by @mccoysc in #60

Full Changelog: v2026.3.8.5...v2026.3.13.0