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/dunder-proto/test/get.js

@@ -0,0 +1,34 @@
+'use strict';
+
+var test = require('tape');
+
+var getDunderProto = require('../get');
+
+test('getDunderProto', { skip: !getDunderProto }, function (t) {
+	if (!getDunderProto) {
+		throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal
+	}
+
+	// @ts-expect-error
+	t['throws'](function () { getDunderProto(); }, TypeError, 'throws if no argument');
+	// @ts-expect-error
+	t['throws'](function () { getDunderProto(undefined); }, TypeError, 'throws with undefined');
+	// @ts-expect-error
+	t['throws'](function () { getDunderProto(null); }, TypeError, 'throws with null');
+
+	t.equal(getDunderProto({}), Object.prototype);
+	t.equal(getDunderProto([]), Array.prototype);
+	t.equal(getDunderProto(function () {}), Function.prototype);
+	t.equal(getDunderProto(/./g), RegExp.prototype);
+	t.equal(getDunderProto(42), Number.prototype);
+	t.equal(getDunderProto(true), Boolean.prototype);
+	t.equal(getDunderProto('foo'), String.prototype);
+
+	t.end();
+});
+
+test('no dunder proto', { skip: !!getDunderProto }, function (t) {
+	t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
+
+	t.end();
+});

web/node_modules/dunder-proto/test/index.js

@@ -0,0 +1,4 @@
+'use strict';
+
+require('./get');
+require('./set');

web/node_modules/dunder-proto/test/set.js

@@ -0,0 +1,50 @@
+'use strict';
+
+var test = require('tape');
+
+var setDunderProto = require('../set');
+
+test('setDunderProto', { skip: !setDunderProto }, function (t) {
+	if (!setDunderProto) {
+		throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal
+	}
+
+	// @ts-expect-error
+	t['throws'](function () { setDunderProto(); }, TypeError, 'throws if no arguments');
+	// @ts-expect-error
+	t['throws'](function () { setDunderProto(undefined); }, TypeError, 'throws with undefined and nothing');
+	// @ts-expect-error
+	t['throws'](function () { setDunderProto(undefined, undefined); }, TypeError, 'throws with undefined and undefined');
+	// @ts-expect-error
+	t['throws'](function () { setDunderProto(null); }, TypeError, 'throws with null and undefined');
+	// @ts-expect-error
+	t['throws'](function () { setDunderProto(null, undefined); }, TypeError, 'throws with null and undefined');
+
+	/** @type {{ inherited?: boolean }} */
+	var obj = {};
+	t.ok('toString' in obj, 'object initially has toString');
+
+	setDunderProto(obj, null);
+	t.notOk('toString' in obj, 'object no longer has toString');
+
+	t.notOk('inherited' in obj, 'object lacks inherited property');
+	setDunderProto(obj, { inherited: true });
+	t.equal(obj.inherited, true, 'object has inherited property');
+
+	t.end();
+});
+
+test('no dunder proto', { skip: !!setDunderProto }, function (t) {
+	if ('__proto__' in Object.prototype) {
+		t['throws'](
+			// @ts-expect-error
+			function () { ({}).__proto__ = null; }, // eslint-disable-line no-proto
+			Error,
+			'throws when setting Object.prototype.__proto__'
+		);
+	} else {
+		t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
+	}
+
+	t.end();
+});