fix: plugin event shape mismatches, nav highlight bug, and README update

- Fix session.created/deleted reading props.info.id instead of props.id
- Fix session.diff reading FileDiff[] array instead of string
- Fix file.edited reading props.file instead of props.filePath
- Add auto-session creation fallback from tool/chat hooks
- Add flushSession() for intermediate trace sends on session.idle
- Fix dashboard nav: /dashboard exact match prevents false active state
- Update README with TypeScript SDK and OpenCode plugin sections

packages/opencode-plugin/src/state.ts

@@ -4,6 +4,7 @@ import {
   SpanStatus,
   DecisionType,
   nowISO,
+  getClient,
 } from "agentlens-sdk";
 import type { JsonValue, TraceStatus } from "agentlens-sdk";
 import { extractToolMetadata, safeJsonValue } from "./utils.js";
@@ -180,4 +181,22 @@ export class SessionState {
   getRootSpanId(sessionId: string): string | undefined {
     return this.rootSpans.get(sessionId);
   }
+
+  getActiveSessionIds(): string[] {
+    return Array.from(this.traces.keys());
+  }
+
+  /**
+   * Send the current trace state without ending the session.
+   * This creates a snapshot so data isn't lost if the process exits unexpectedly.
+   */
+  flushSession(sessionId: string): void {
+    const trace = this.traces.get(sessionId);
+    if (!trace) return;
+
+    const transport = getClient();
+    if (transport) {
+      transport.add(trace.toPayload());
+    }
+  }
 }