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`disable = false` is a double negative, and a bool named disable cannot express opt-in anyway: it zero-values to false, so the flag was inert and opt-in rested entirely on the device list being empty. `enable` defaults to false and is now the real gate -- Initialize, Metrics and DebugInput all return early unless it is set. The two existing guards remain: an empty device list is still a no-op, and no default URL is ever synthesized. Configuring devices while enable is false is always a mistake, so that combination logs one error instead of silently collecting nothing. Adds binding tests for the flag across toml, json, yaml and UP_UNAS_ENABLE (the env name derives from the xml tag, not the json one), plus a test that all three shipped examples default to off. Both were verified by mutation: breaking a struct tag or flipping an example fails the suite. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>