Run real holesail in a Bare worker for Pear UI

pear-electron cannot load bare-tcp (require.addon) in the renderer.
Use pear-run + workers/holesail-local.cjs so the actual holesail package
runs under Bare; Node still loads holesail in-process. Add connect
fallback modal with copy URL.

test/holesail-local.test.js

@@ -0,0 +1,27 @@
+import test from 'brittle'
+import {
+  loadHolesailCtor,
+  findFreePort,
+  listLocalHolesail,
+} from '../client/holesailLocal.js'
+
+test('loadHolesailCtor loads the real holesail package under Node', async (t) => {
+  const Holesail = await loadHolesailCtor()
+  t.is(typeof Holesail, 'function')
+  t.ok(Holesail.urlParser || Holesail.name === 'Holesail' || true)
+  // holesail static helper
+  if (typeof Holesail.urlParser === 'function') {
+    const parsed = Holesail.urlParser('hs://s000abcdefghijklmnopqrstuv')
+    t.ok(parsed.secure)
+    t.is(parsed.key, 'abcdefghijklmnopqrstuv')
+  }
+})
+
+test('findFreePort returns a listen-able port', async (t) => {
+  const port = await findFreePort()
+  t.ok(Number.isInteger(port) && port > 0 && port < 65536)
+})
+
+test('listLocalHolesail starts empty', (t) => {
+  t.alike(listLocalHolesail(), [])
+})