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/chai/lib/chai.js

@@ -0,0 +1,66 @@
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+import * as util from './chai/utils/index.js';
+import {AssertionError} from 'assertion-error';
+import {config} from './chai/config.js';
+import './chai/core/assertions.js';
+import {expect} from './chai/interface/expect.js';
+import {Assertion} from './chai/assertion.js';
+import * as should from './chai/interface/should.js';
+import {assert} from './chai/interface/assert.js';
+
+const used = [];
+
+// Assertion Error
+export {AssertionError};
+
+/**
+ * # .use(function)
+ *
+ * Provides a way to extend the internals of Chai.
+ *
+ * @param {Function} fn
+ * @returns {this} for chaining
+ * @public
+ */
+export function use(fn) {
+  const exports = {
+    use,
+    AssertionError,
+    util,
+    config,
+    expect,
+    assert,
+    Assertion,
+    ...should
+  };
+
+  if (!~used.indexOf(fn)) {
+    fn(exports, util);
+    used.push(fn);
+  }
+
+  return exports;
+}
+
+// Utility Functions
+export {util};
+
+// Configuration
+export {config};
+
+// Primary `Assertion` prototype
+export * from './chai/assertion.js';
+
+// Expect interface
+export * from './chai/interface/expect.js';
+
+// Should interface
+export * from './chai/interface/should.js';
+
+// Assert interface
+export * from './chai/interface/assert.js';