fix(ping): use transport-level health check for SSE servers #74

Job	Run time
lint-and-typecheck	10s
test (tests/cli)	22s
test (tests/commands)	23s
test (tests/chat)	35s
test (tests/apps)	17s
test (tests/context)	16s
test (tests/config)	18s
test (tests/model_management)	18s
test (tests/test_command_consistency.py tests/test_mcp_cli_init.py tests/test_mcp_cli_main_entry.py)	17s
test (tests/core)	14s
test (tests/interactive)	16s
test (tests/auth)	15s
test (tests/utils)	16s
test (tests/memory)	15s
test (tests/tools)	20s
test (tests/adapters)	15s
test (tests/display)	20s
report-coverage	-1s
	5m 6s

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