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/package.json

@@ -1,6 +1,6 @@
 {
   "name": "opencode-agentlens",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "OpenCode plugin for AgentLens — trace your coding agent's decisions, tool calls, and sessions",
   "type": "module",
   "main": "./dist/index.cjs",