feat(relay): rendezvous-relay service — 7 packages + plans (contracts/transport/agent/control-plane/e2e/auth/web)

Multi-tenant reverse-tunnel service ("ngrok for Claude Code" with E2E): a
host-agent dials OUT to an operator-run relay; external devices reach the host
THROUGH the relay, routed by per-tenant subdomain, forwarding ciphertext only
(the relay never sees plaintext). Lets a customer reach their own self-hosted
web-terminal from anywhere with zero networking setup.

Packages — all tsc-strict + vitest green (656 tests), cross-package integration verified:
- relay-contracts: frozen shared contracts (mux frame codec, data model,
  capability token, E2E envelope, pairing) — the src/types.ts analog
- term-relay:   native WS mux + stateless data plane (subdomain routing, ciphertext forward)
- agent:        host-agent (pairing, per-host Ed25519 + mTLS dial-out, forwards to 127.0.0.1:3000)
- control-plane: accounts/hosts registry, pairing-code flow, routing table, provisioning
- relay-e2e:    browser<->agent E2E (X25519 ECDH through relay, AEAD, anti-replay, recoverable replay key)
- relay-auth:   Passkey/WebAuthn, capability tokens, per-host certs, deny-by-default tenant isolation
- relay-web:    browser login + Web Crypto E2E + client-side preview rendering

Security invariants INV1-15 enforced; cross-tenant isolation CI tripwire live
(.github/workflows/relay-tripwire.yml). Design + implementation-level plans in
docs/PLAN_RELAY_*.md and docs/EXPLORE_RELAY_SERVICE.md.

NOTE: generated autonomously per the reviewed plans. The security-critical
packages (relay-e2e, relay-auth) REQUIRE expert security audit before any real
deployment — passing tests prove self-consistency, not resistance to attackers.
Base app (src/, public/) unchanged; concurrent desktop work left uncommitted.

relay-web/build.mjs

@@ -0,0 +1,30 @@
+/**
+ * relay-web esbuild bundler (T1). Bundles each static entry page's TS to public/build/.
+ * Browser target, ESM, sourcemaps — mirrors the base app's `build:web` conventions without
+ * importing public/. No inline script anywhere (strict-CSP friendly); every HTML page loads
+ * its bundle via <script type="module" src="build/<name>.js">.
+ */
+import { build } from 'esbuild'
+import { fileURLToPath } from 'node:url'
+import { dirname, resolve } from 'node:path'
+
+const here = dirname(fileURLToPath(import.meta.url))
+
+/** Entry map: bundle name -> source module. Add a line per new HTML page. */
+const ENTRIES = {
+  index: resolve(here, 'src/entry/index-page.ts'),
+  dashboard: resolve(here, 'src/entry/dashboard-page.ts'),
+  pair: resolve(here, 'src/entry/pair-page.ts'),
+  manage: resolve(here, 'src/entry/manage-page.ts'),
+}
+
+await build({
+  entryPoints: ENTRIES,
+  outdir: resolve(here, 'public/build'),
+  bundle: true,
+  format: 'esm',
+  platform: 'browser',
+  target: ['es2022'],
+  sourcemap: true,
+  logLevel: 'info',
+})