Forward swift-log to Measure on iOS

On iOS, Measure can't collect logs automatically. Apple's unified logging (os.Logger, os_log, and NSLog) writes to out-of-process system daemons with no public hook to observe, so the SDK can't intercept those calls. If your app uses swift-log, register a LogHandler that forwards every record to Measure. Bootstrap it once, before any logging runs:

import Logging
import Measure

struct MeasureLogHandler: LogHandler {
    var metadata = Logger.Metadata()
    var logLevel: Logger.Level = .info

    subscript(metadataKey key: String) -> Logger.Metadata.Value? {
        get { metadata[key] }
        set { metadata[key] = newValue }
    }

    func log(level: Logger.Level, message: Logger.Message, metadata: Logger.Metadata?,
             source: String, file: String, function: String, line: UInt) {
        Measure.log("\(message)", severity: level.measureSeverity)
    }
}

private extension Logger.Level {
    var measureSeverity: LogSeverity {
        switch self {
        case .trace, .debug: return .debug
        case .info, .notice: return .info
        case .warning: return .warning
        case .error: return .error
        case .critical: return .fatal
        }
    }
}

// Call once during startup, e.g. in your AppDelegate.
LoggingSystem.bootstrap { _ in MeasureLogHandler() }