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/browser/dist/nodes/Node.js

@@ -0,0 +1,38 @@
+import { applyReviver } from '../doc/applyReviver.js';
+import { NODE_TYPE, isDocument } from './identity.js';
+import { toJS } from './toJS.js';
+
+class NodeBase {
+    constructor(type) {
+        Object.defineProperty(this, NODE_TYPE, { value: type });
+    }
+    /** Create a copy of this node.  */
+    clone() {
+        const copy = Object.create(Object.getPrototypeOf(this), Object.getOwnPropertyDescriptors(this));
+        if (this.range)
+            copy.range = this.range.slice();
+        return copy;
+    }
+    /** A plain JavaScript representation of this node. */
+    toJS(doc, { mapAsMap, maxAliasCount, onAnchor, reviver } = {}) {
+        if (!isDocument(doc))
+            throw new TypeError('A document argument is required');
+        const ctx = {
+            anchors: new Map(),
+            doc,
+            keep: true,
+            mapAsMap: mapAsMap === true,
+            mapKeyWarned: false,
+            maxAliasCount: typeof maxAliasCount === 'number' ? maxAliasCount : 100
+        };
+        const res = toJS(this, '', ctx);
+        if (typeof onAnchor === 'function')
+            for (const { count, res } of ctx.anchors.values())
+                onAnchor(res, count);
+        return typeof reviver === 'function'
+            ? applyReviver(reviver, { '': res }, '', res)
+            : res;
+    }
+}
+
+export { NodeBase };