webmcp: framework/env/trace/_

webmcp

Replace global environment as soon as possible in mcp.lua

rev	line source
jbe@41	1 trace._disabled = false
bsw@115	2 trace._tree = { type = "root", start_hires_time = extos.monotonic_hires_time() }
jbe/bsw@0	3 trace._stack = { trace._tree }