feat: Phase 1 — extract the client (web SPA + desktop) to dtoro/oikos-web

Problem: the hexagonal refactor churns the backend tree for nine more
phases; the UI delivery stack (web/ SPA, cmd/desktop Wails wrapper,
compose/web image) must move to its own repo first so doc/layout
rewrites land once on a backend-only tree.

Change:
- New repo git.hubris.network/dtoro/oikos-web (v0.33.0): web/, desktop/
  (updateURL repointed to oikos-web releases), compose/, own CI (web +
  desktop jobs), own deploy script (CI-green gate, TOCTOU guard,
  version-tagged images, prune-to-3), own webhook receiver on :9798 +
  launchd unit, own compose project publishing the same 8091:80.
- Cutover executed on mac-mini in order: oikos stack's web service
  stopped+removed, oikos-web project brought up on 8091; outer Caddy
  untouched (targets the published port) — serving + Authentik flow +
  /wails 404 quirk verified post-cutover.
- Stripped from oikos: web/, cmd/desktop/, compose/web/, desktop CI
  workflow, ci.yml web job, Makefile ui/desktop/desktop-package/install
  targets, the compose web service, oikos-web from deploy.sh's fallback
  prune list; wails + go-keyring dropped from go.mod, vendor synced.
- README / CONTRIBUTING / AGENTS.md / .agents dev+operations docs now
  point at the new repo; mbse + mascot design docs carry a path note.

Risk: production SPA serving depends on the new pipeline now; rollback
is versioned-image re-up of the old web service from a pre-split
checkout (port 8091). Desktop builds installed before the split still
check dtoro/oikos releases — one manual reinstall, noted in the
oikos-web release notes.

Verification: go vet, make test (race), make generate-check, golangci
(no new findings; baseline down 400→365); post-cutover curls —
localhost:8091 200, /wails/runtime.js 404, outer Caddy 302 Authentik.

web/node_modules/events/tests/modify-in-emit.js

@@ -0,0 +1,90 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+require('./common');
+var assert = require('assert');
+var events = require('../');
+
+var callbacks_called = [];
+
+var e = new events.EventEmitter();
+
+function callback1() {
+  callbacks_called.push('callback1');
+  e.on('foo', callback2);
+  e.on('foo', callback3);
+  e.removeListener('foo', callback1);
+}
+
+function callback2() {
+  callbacks_called.push('callback2');
+  e.removeListener('foo', callback2);
+}
+
+function callback3() {
+  callbacks_called.push('callback3');
+  e.removeListener('foo', callback3);
+}
+
+e.on('foo', callback1);
+assert.strictEqual(e.listeners('foo').length, 1);
+
+e.emit('foo');
+assert.strictEqual(e.listeners('foo').length, 2);
+assert.ok(Array.isArray(callbacks_called));
+assert.strictEqual(callbacks_called.length, 1);
+assert.strictEqual(callbacks_called[0], 'callback1');
+
+e.emit('foo');
+assert.strictEqual(e.listeners('foo').length, 0);
+assert.ok(Array.isArray(callbacks_called));
+assert.strictEqual(callbacks_called.length, 3);
+assert.strictEqual(callbacks_called[0], 'callback1');
+assert.strictEqual(callbacks_called[1], 'callback2');
+assert.strictEqual(callbacks_called[2], 'callback3');
+
+e.emit('foo');
+assert.strictEqual(e.listeners('foo').length, 0);
+assert.ok(Array.isArray(callbacks_called));
+assert.strictEqual(callbacks_called.length, 3);
+assert.strictEqual(callbacks_called[0], 'callback1');
+assert.strictEqual(callbacks_called[1], 'callback2');
+assert.strictEqual(callbacks_called[2], 'callback3');
+
+e.on('foo', callback1);
+e.on('foo', callback2);
+assert.strictEqual(e.listeners('foo').length, 2);
+e.removeAllListeners('foo');
+assert.strictEqual(e.listeners('foo').length, 0);
+
+// Verify that removing callbacks while in emit allows emits to propagate to
+// all listeners
+callbacks_called = [];
+
+e.on('foo', callback2);
+e.on('foo', callback3);
+assert.strictEqual(2, e.listeners('foo').length);
+e.emit('foo');
+assert.ok(Array.isArray(callbacks_called));
+assert.strictEqual(callbacks_called.length, 2);
+assert.strictEqual(callbacks_called[0], 'callback2');
+assert.strictEqual(callbacks_called[1], 'callback3');
+assert.strictEqual(0, e.listeners('foo').length);