chore: initial coresync scaffold

EVOLV CoreSync node — FROST/SensorThings handoff path. First version forwards FROST-ready HTTP request messages on the dbase output; a downstream Node-RED http-request node performs the actual POST and feeds responses back on msg.topic = "frost.response". Lazy stream resolver, latest-wins queue for unresolved/FROST-down streams (keep first + latest, drop middle), knot-emit on slope change, provenance preserved in Observation parameters.

Interview state + open Q20 (slope angle vs. relative delta) recorded in superproject CORESYNC_FROST_INTERVIEW_HANDOFF.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

coresync.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const { CoreSyncDomain } = require('./src/coreSyncDomain');
+
+module.exports = function(RED) {
+  RED.nodes.registerType('coresync', function(config) {
+    RED.nodes.createNode(this, config);
+    const node = this;
+    const hub = new CoreSyncDomain({
+      frostBaseUrl: config.frostBaseUrl,
+      serviceVersion: config.serviceVersion,
+      dbaseFormat: config.dbaseFormat,
+      assetTagOverride: config.assetTagOverride,
+      sensorTagOverride: config.sensorTagOverride,
+      maxQueuedObservationsPerStream: config.maxQueuedObservationsPerStream,
+      reducer: {
+        angleToleranceDeg: Number(config.angleToleranceDeg),
+        timeScaleMs: Number(config.timeScaleMs),
+        maxGapMs: Number(config.maxGapMs),
+        minDeltaTimeMs: Number(config.minDeltaTimeMs),
+        minDeltaValue: Number(config.minDeltaValue),
+        comparisonMode: config.comparisonMode || 'angle',
+      },
+    });
+
+    node.on('input', (msg, send, done) => {
+      try {
+        const output = hub.handleMessage(msg);
+        const dbaseCount = Array.isArray(output[1]) ? output[1].length : (output[1] ? 1 : 0);
+        if (dbaseCount > 0) node.status({ fill: 'blue', shape: 'dot', text: `${dbaseCount} FROST request(s)` });
+        send(output);
+      } catch (error) {
+        node.status({ fill: 'red', shape: 'ring', text: error.message });
+        node.error(error, msg);
+      } finally {
+        if (typeof done === 'function') done();
+      }
+    });
+
+    node.on('close', (removed, done) => {
+      const closeDone = typeof removed === 'function' ? removed : done;
+      try {
+        const output = hub.flushAll('close');
+        if (output[1]) node.send(output);
+        node.status({});
+      } finally {
+        if (typeof closeDone === 'function') closeDone();
+      }
+    });
+  });
+};