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-unused-class-name.js

@@ -0,0 +1,106 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const utils_1 = require("../utils");
+const postcss_selector_parser_1 = __importDefault(require("postcss-selector-parser"));
+const compat_1 = require("../utils/compat");
+exports.default = (0, utils_1.createRule)('no-unused-class-name', {
+    meta: {
+        docs: {
+            description: 'disallow the use of a class in the template without a corresponding style',
+            category: 'Best Practices',
+            recommended: false
+        },
+        schema: [
+            {
+                type: 'object',
+                properties: {
+                    allowedClassNames: {
+                        type: 'array',
+                        items: {
+                            type: 'string'
+                        }
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+        messages: {},
+        type: 'suggestion'
+    },
+    create(context) {
+        const sourceCode = (0, compat_1.getSourceCode)(context);
+        if (!sourceCode.parserServices.isSvelte) {
+            return {};
+        }
+        const allowedClassNames = context.options[0]?.allowedClassNames ?? [];
+        const classesUsedInTemplate = {};
+        return {
+            SvelteElement(node) {
+                if (node.kind !== 'html') {
+                    return;
+                }
+                const classes = node.startTag.attributes.flatMap(findClassesInAttribute);
+                for (const className of classes) {
+                    classesUsedInTemplate[className] = node.startTag.loc;
+                }
+            },
+            'Program:exit'() {
+                const styleContext = sourceCode.parserServices.getStyleContext();
+                if (styleContext.status === 'parse-error' || styleContext.status === 'unknown-lang') {
+                    return;
+                }
+                const classesUsedInStyle = styleContext.status === 'success' ? findClassesInPostCSSNode(styleContext.sourceAst) : [];
+                for (const className in classesUsedInTemplate) {
+                    if (!allowedClassNames.includes(className) && !classesUsedInStyle.includes(className)) {
+                        context.report({
+                            loc: classesUsedInTemplate[className],
+                            message: `Unused class "${className}".`
+                        });
+                    }
+                }
+            }
+        };
+    }
+});
+/**
+ * Extract all class names used in a HTML element attribute.
+ */
+function findClassesInAttribute(attribute) {
+    if (attribute.type === 'SvelteAttribute' && attribute.key.name === 'class') {
+        return attribute.value.flatMap((value) => value.type === 'SvelteLiteral' ? value.value.trim().split(/\s+/u) : []);
+    }
+    if (attribute.type === 'SvelteDirective' && attribute.kind === 'Class') {
+        return [attribute.key.name.name];
+    }
+    return [];
+}
+/**
+ * Extract all class names used in a PostCSS node.
+ */
+function findClassesInPostCSSNode(node) {
+    if (node.type === 'rule') {
+        let classes = node.nodes.flatMap(findClassesInPostCSSNode);
+        const processor = (0, postcss_selector_parser_1.default)();
+        classes = classes.concat(findClassesInSelector(processor.astSync(node.selector)));
+        return classes;
+    }
+    if ((node.type === 'root' || node.type === 'atrule') && node.nodes !== undefined) {
+        return node.nodes.flatMap(findClassesInPostCSSNode);
+    }
+    return [];
+}
+/**
+ * Extract all class names used in a PostCSS selector.
+ */
+function findClassesInSelector(node) {
+    if (node.type === 'class') {
+        return [node.value];
+    }
+    if (node.type === 'pseudo' || node.type === 'root' || node.type === 'selector') {
+        return node.nodes.flatMap(findClassesInSelector);
+    }
+    return [];
+}