fix(mcp): reconnect on terminated sessions#19380
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Salvage of #19232 by @LeonSGP43 onto current main.
Summary
Treat MCP
Session terminatederrors as transport-session expiry signals so the existing reconnect-and-retry path kicks in instead of surfacing a hard tool failure. Observed with remote Playwright MCPs.Changes
"session terminated"to_SESSION_EXPIRED_PATTERNSValidation
scripts/run_tests.sh tests/tools/test_mcp_tool_session_expired.py → 17 passed
Original PR: #19232
Fixes: #18790