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/graphology-utils/infer-multi.js

@@ -0,0 +1,48 @@
+/**
+ * Graphology inferMulti
+ * ======================
+ *
+ * Useful function used to "guess" if the given graph is truly multi.
+ */
+var isGraph = require('./is-graph.js');
+
+/**
+ * Returning whether the given graph is inferred as multi.
+ *
+ * @param  {Graph}   graph - Target graph.
+ * @return {boolean}
+ */
+module.exports = function inferMulti(graph) {
+  if (!isGraph(graph))
+    throw new Error(
+      'graphology-utils/infer-multi: expecting a valid graphology instance.'
+    );
+
+  if (!graph.multi || graph.order === 0 || graph.size < 2) return false;
+
+  var multi = false;
+
+  // TODO: improve this with suitable methods
+  var previousSource, previousTarget, wasUndirected, tmp;
+
+  graph.forEachAssymetricAdjacencyEntry(function (s, t, sa, ta, e, ea, u) {
+    if (multi) return; // TODO: we need #.someAdjacencyEntry
+
+    if (u && s > t) {
+      tmp = t;
+      t = s;
+      s = tmp;
+    }
+
+    if (s === previousSource && t === previousTarget && u === wasUndirected) {
+      multi = true;
+      return;
+    }
+
+    previousSource = s;
+    previousTarget = t;
+    wasUndirected = u;
+  });
+
+  return multi;
+};