feat(chord): telemetry from pages and workers stored by the server, who a span was for

The four telemetry gaps (rows on commits, chord.host, microsecond times, a read-only store) and: pages record and
send span batches over their link to the server's ingest object (checked, capped, rate-limited, stamped browser and
with the link's principal); workers send theirs too, so the server is the store's only writer; principalAttributes
lets an app choose what a span records about its principal. The tutorial shows a real page's click traced to the
worker, with the trace viewer.

packages/chord/package.json

@@ -56,6 +56,11 @@
 			"types": "./dist/telemetry-sqlite/index.d.ts",
 			"import": "./dist/telemetry-sqlite/index.js"
 		},
+		"./telemetry-sqlite/node": {
+			"source": "./src/telemetry-sqlite/node.ts",
+			"types": "./dist/telemetry-sqlite/node.d.ts",
+			"import": "./dist/telemetry-sqlite/node.js"
+		},
 		"./http": {
 			"source": "./src/node/http/index.ts",
 			"types": "./dist/node/http/index.d.ts",