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-object-in-text-mustaches.js

@@ -0,0 +1,51 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const utils_1 = require("../utils");
+const PHRASES = {
+    ObjectExpression: 'object',
+    ArrayExpression: 'array',
+    ArrowFunctionExpression: 'function',
+    FunctionExpression: 'function',
+    ClassExpression: 'class'
+};
+exports.default = (0, utils_1.createRule)('no-object-in-text-mustaches', {
+    meta: {
+        docs: {
+            description: 'disallow objects in text mustache interpolation',
+            category: 'Possible Errors',
+            recommended: true
+        },
+        schema: [],
+        messages: {
+            unexpected: 'Unexpected {{phrase}} in text mustache interpolation.'
+        },
+        type: 'problem' // "problem", or "layout",
+    },
+    create(context) {
+        return {
+            SvelteMustacheTag(node) {
+                const { expression } = node;
+                if (expression.type !== 'ObjectExpression' &&
+                    expression.type !== 'ArrayExpression' &&
+                    expression.type !== 'ArrowFunctionExpression' &&
+                    expression.type !== 'FunctionExpression' &&
+                    expression.type !== 'ClassExpression') {
+                    return;
+                }
+                if (node.parent.type === 'SvelteAttribute') {
+                    if (node.parent.value.length === 1) {
+                        // Maybe props
+                        return;
+                    }
+                }
+                context.report({
+                    node,
+                    messageId: 'unexpected',
+                    data: {
+                        phrase: PHRASES[expression.type]
+                    }
+                });
+            }
+        };
+    }
+});