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/eslint-plugin-svelte/lib/rules/no-target-blank.js

@@ -0,0 +1,85 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const utils_1 = require("../utils");
+const ast_utils_1 = require("../utils/ast-utils");
+/** Checks wether the given attr node is target="_blank"  */
+function isTargetBlank(node) {
+    return node.key.name === 'target' && (0, ast_utils_1.getStaticAttributeValue)(node) === '_blank';
+}
+/** Checks wether the given element node has secure rel="..." */
+function hasSecureRel(node, allowReferrer) {
+    const attr = (0, ast_utils_1.findAttribute)(node, 'rel');
+    if (attr) {
+        const tags = [];
+        for (const value of attr.value) {
+            if (value.type === 'SvelteLiteral') {
+                tags.push(...value.value.toLowerCase().split(' '));
+            }
+        }
+        return tags && tags.includes('noopener') && (allowReferrer || tags.includes('noreferrer'));
+    }
+    return false;
+}
+/** Checks wether the given element node has external link */
+function hasExternalLink(node) {
+    return node.attributes.some((attr) => attr.type === 'SvelteAttribute' &&
+        attr.key.name === 'href' &&
+        attr.value.length >= 1 &&
+        attr.value[0].type === 'SvelteLiteral' &&
+        /^(?:\w+:|\/\/)/.test(attr.value[0].value));
+}
+/** Checks wether the given element node has dynamic link */
+function hasDynamicLink(node) {
+    const attr = (0, ast_utils_1.findAttribute)(node, 'href');
+    if (attr) {
+        return attr.value.some((v) => v.type === 'SvelteMustacheTag');
+    }
+    return Boolean((0, ast_utils_1.findShorthandAttribute)(node, 'href')) || Boolean((0, ast_utils_1.findBindDirective)(node, 'href'));
+}
+exports.default = (0, utils_1.createRule)('no-target-blank', {
+    meta: {
+        docs: {
+            description: 'disallow `target="_blank"` attribute without `rel="noopener noreferrer"`',
+            category: 'Security Vulnerability',
+            recommended: false
+        },
+        schema: [
+            {
+                type: 'object',
+                properties: {
+                    allowReferrer: {
+                        type: 'boolean'
+                    },
+                    enforceDynamicLinks: {
+                        enum: ['always', 'never']
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+        messages: {
+            disallow: 'Using target="_blank" without rel="noopener noreferrer" is a security risk.'
+        },
+        type: 'problem'
+    },
+    create(context) {
+        const configuration = context.options[0] || {};
+        const allowReferrer = Boolean(configuration.allowReferrer) || false;
+        const enforceDynamicLinks = configuration.enforceDynamicLinks || 'always';
+        return {
+            SvelteAttribute(node) {
+                if (!isTargetBlank(node) || hasSecureRel(node.parent, allowReferrer)) {
+                    return;
+                }
+                const hasDangerHref = hasExternalLink(node.parent) ||
+                    (enforceDynamicLinks === 'always' && hasDynamicLink(node.parent));
+                if (hasDangerHref) {
+                    context.report({
+                        node,
+                        message: 'Using target="_blank" without rel="noopener noreferrer" is a security risk.'
+                    });
+                }
+            }
+        };
+    }
+});