Implement hrpc with streaming and wire into setup

- Add spec/hyperschema and spec/hrpc codegen (scripts/build-hrpc.js)
  with unary, request/response-stream, duplex, and send-only commands
- Run build:hrpc and build:protomux from install.sh so setup is one-step
- Native host: add attachHrpc (Protomux channel + generated HRPC),
  handlers for ping, streamSum, fetchStream, duplex, notify
- Load HRPC lazily so missing spec does not crash host; use bare-stream
  for Duplex under Bare; add bare-stream, compact-encoding deps

extension/manifest.json

@@ -3,7 +3,7 @@
   "name": "BridgeSwarm",
   "version": "1.0.0",
   "description": "P2P Hyperswarm in the browser via native messaging host",
-  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwRj35u4A3WifVvGNkCjs4ezIDgHKATk4gB5WgJUmgPgNVSOxIcew8yTSkoVQURN+fP7qX1wwxfbvL6xno4i8s4iAbAEhs9WNXv9dXXNdo8nJFooQ6PME6kBZBh8by6IJdhJqxykrs7syuQDCsP+g06a3Ar5/tjGAdfX5c1cIiyT6m+VhQED/oezEV/d6qjBNJmsbMIuwhm2mRc5bmgCXDxXcn1CjvF555LCCLB4GH9tm/qqgK4NMhrzqx4bmktCdPaWHqImp+K8lEkhm82nPCuxoZXaxdkS9EaMFHlVR9MIBrzZs6EkXnWdPxnvrqsMg1G4jt9PWJsfqpUcqRgLmlwIDAQAB",
+  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkikOI5ZYZ170eU5L6YOjI5TP78Et2bCSxB4TD5n/K6zfCTZCuVeyX3B4jbtiJL3RHkJpeqXKpdveEn4Wkt/uYENin7bPMAVcUvBBCIidFXaEqiup0fzeRo+bNFbNwOaO+mG1qFQ77xgK0iHR6JCW/VHeAl8+pa1UaqWNTeRX/9j+kuLGAzQa+bVI3UhfBRlUFi4W4BO33y/O/5bRTWdg48c9CSJT09nIulMUCsI2TGkxvVK8lcvBWutfABpixyGVqadtUZ3Xpap0/K5iRm9WWdPM9BxgN1cAZq8reVXltpKePC64ZI2kzQQUQzJ2zmqXq98I2ikUbclD/n5NRDN9PQIDAQAB",
   "permissions": [
     "nativeMessaging",
     "storage",
@@ -42,7 +42,7 @@
   },
   "browser_specific_settings": {
     "gecko": {
-      "id": "bridgeswarm-7b9cba818d22b161@example.org",
+      "id": "bridgeswarm-395cda49a8e4c8d8@example.org",
       "strict_min_version": "79.0"
     }
   }