refactor: consolidate requests and finalize agent tool states

Share project JSON transport, interaction replies and report selectors.
Settle tool progress consistently for direct streams, reconnects and history, preserving failure reasons and stopped state.

package.json

@@ -10,6 +10,7 @@
   "scripts": {
     "dev": "vite",
     "export:answer-ui-contract": "node scripts/export-answer-ui-contract.mjs",
+    "check:contracts": "node scripts/export-answer-ui-contract.mjs --check && node scripts/export-view-command-contract.mjs --check",
     "build": "tsc --noEmit && vite build && pnpm build:verify-css && pnpm build:tts",
     "build:verify-css": "node scripts/verify-production-css.mjs",
     "build:tts": "esbuild server/edge-tts-server.ts --bundle --platform=node --format=cjs --outfile=dist-server/edge-tts-server.cjs",