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/yaml/dist/doc/applyReviver.js

@@ -0,0 +1,57 @@
+'use strict';
+
+/**
+ * Applies the JSON.parse reviver algorithm as defined in the ECMA-262 spec,
+ * in section 24.5.1.1 "Runtime Semantics: InternalizeJSONProperty" of the
+ * 2021 edition: https://tc39.es/ecma262/#sec-json.parse
+ *
+ * Includes extensions for handling Map and Set objects.
+ */
+function applyReviver(reviver, obj, key, val) {
+    if (val && typeof val === 'object') {
+        if (Array.isArray(val)) {
+            for (let i = 0, len = val.length; i < len; ++i) {
+                const v0 = val[i];
+                const v1 = applyReviver(reviver, val, String(i), v0);
+                // eslint-disable-next-line @typescript-eslint/no-array-delete
+                if (v1 === undefined)
+                    delete val[i];
+                else if (v1 !== v0)
+                    val[i] = v1;
+            }
+        }
+        else if (val instanceof Map) {
+            for (const k of Array.from(val.keys())) {
+                const v0 = val.get(k);
+                const v1 = applyReviver(reviver, val, k, v0);
+                if (v1 === undefined)
+                    val.delete(k);
+                else if (v1 !== v0)
+                    val.set(k, v1);
+            }
+        }
+        else if (val instanceof Set) {
+            for (const v0 of Array.from(val)) {
+                const v1 = applyReviver(reviver, val, v0, v0);
+                if (v1 === undefined)
+                    val.delete(v0);
+                else if (v1 !== v0) {
+                    val.delete(v0);
+                    val.add(v1);
+                }
+            }
+        }
+        else {
+            for (const [k, v0] of Object.entries(val)) {
+                const v1 = applyReviver(reviver, val, k, v0);
+                if (v1 === undefined)
+                    delete val[k];
+                else if (v1 !== v0)
+                    val[k] = v1;
+            }
+        }
+    }
+    return reviver.call(obj, key, val);
+}
+
+exports.applyReviver = applyReviver;