v0.4.0 - OpenCode v2 support (stable)

v0.4.0 — OpenCode v2 support (stable)

Promotes v0.4.0-beta.1 to stable with loader fixes verified end to end against
OpenCode 2.0.2: the server reports
"features":{"server":true,"tui":true},"state":{"status":"active"} for the
plugin, and the meter renders in the TUI prompt footer. Install with
opencode-tps-meter@latest. Everything in the beta.1 notes below carries over.

🐞 Fixed since beta.1

• Removed the tui: true flag from the server plugin definition. The loader
  treats any tui key as a legacy handler and throws
  Plugin <spec> has invalid tui export on a non-function, aborting the whole
  plugin load with no meter.
• ./server resolves to the dual-host dist/index.mjs again ({ id, server, setup }), the only shape valid on both loaders. The v2-only
  dist/v2/server.mjs ({ id, setup }) fails the v1 server() requirement.
  The /v2 exports remain for programmatic import only.
• Local file:// installs must target <package>/dist, not the repo root.
  The 2.0.2 resolver handles local directories by file path (<dir>/server,
  <dir>/index, <dir>/tui) and ignores package.json#exports there, so the
  repo root (no root index.*) is silently skipped. dist/ contains both
  index.mjs (server) and tui.mjs (TUI).
• A build-invariants regression test now locks both entrypoints against both
  loaders, including a direct guard on dist/v2/server.mjs.

📝 Notes

• OpenCode 2.x ships its own per-message tok/s readout next to each assistant
  reply. To show only this plugin's meter, set "tps": false under session in
  cli.json. To keep the built-in readout instead, run /tps hidden.
• Local installs should register file:///<path>/opencode-tps-meter/dist in
  opencode.json (plugin), cli.json (plugins), and tui.json (plugin).