chore: add devtools-vite changeset, remove planning docs from PR

Author: AlemTuzlak

.changeset/devtools-vite-runtime-bridge.md

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+---
+'@tanstack/devtools-vite': minor
+---
+
+feat: deliver devtools events from isolated server runtimes over Vite's native HotChannel
+
+Server code running in an isolated runtime (Nitro v3 worker thread, Cloudflare `workerd`, or any separate thread/process) does not share `globalThis.__TANSTACK_EVENT_TARGET__` with the Vite dev process, so devtools events emitted on the server never reached the panel.
+
+The Vite plugin now bridges those events over the framework's existing `import.meta.hot` HotChannel — the same connection the runtime already uses for HMR. It injects a tiny, dev-only bridge into the event client when it runs in a non-client environment and wires each server environment's hot channel to the in-process `ServerEventBus`. No new WebSocket, no fetch, no reconnect logic, and no new runtime dependencies; the bridge is fully tree-shaken in production.