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-extra-reactive-curlies.js

@@ -0,0 +1,51 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const utils_1 = require("../utils");
+const compat_1 = require("../utils/compat");
+exports.default = (0, utils_1.createRule)('no-extra-reactive-curlies', {
+    meta: {
+        docs: {
+            description: 'disallow wrapping single reactive statements in curly braces',
+            category: 'Stylistic Issues',
+            recommended: false,
+            conflictWithPrettier: false
+        },
+        hasSuggestions: true,
+        schema: [],
+        messages: {
+            extraCurlies: `Do not wrap reactive statements in curly braces unless necessary.`,
+            removeExtraCurlies: `Remove the unnecessary curly braces.`
+        },
+        type: 'suggestion'
+    },
+    create(context) {
+        return {
+            // $: { foo = "bar"; }
+            [`SvelteReactiveStatement > BlockStatement[body.length=1]`]: (node) => {
+                const source = (0, compat_1.getSourceCode)(context);
+                return context.report({
+                    node,
+                    loc: node.loc,
+                    messageId: 'extraCurlies',
+                    suggest: [
+                        {
+                            messageId: 'removeExtraCurlies',
+                            fix(fixer) {
+                                const tokens = source.getTokens(node, { includeComments: true });
+                                // Remove everything up to the second token, and the entire last token since
+                                // those are known to be "{" and "}"
+                                return [
+                                    fixer.removeRange([tokens[0].range[0], tokens[1].range[0]]),
+                                    fixer.removeRange([
+                                        tokens[tokens.length - 2].range[1],
+                                        tokens[tokens.length - 1].range[1]
+                                    ])
+                                ];
+                            }
+                        }
+                    ]
+                });
+            }
+        };
+    }
+});