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/anchors.js

@@ -0,0 +1,76 @@
+'use strict';
+
+var identity = require('../nodes/identity.js');
+var visit = require('../visit.js');
+
+/**
+ * Verify that the input string is a valid anchor.
+ *
+ * Will throw on errors.
+ */
+function anchorIsValid(anchor) {
+    if (/[\x00-\x19\s,[\]{}]/.test(anchor)) {
+        const sa = JSON.stringify(anchor);
+        const msg = `Anchor must not contain whitespace or control characters: ${sa}`;
+        throw new Error(msg);
+    }
+    return true;
+}
+function anchorNames(root) {
+    const anchors = new Set();
+    visit.visit(root, {
+        Value(_key, node) {
+            if (node.anchor)
+                anchors.add(node.anchor);
+        }
+    });
+    return anchors;
+}
+/** Find a new anchor name with the given `prefix` and a one-indexed suffix. */
+function findNewAnchor(prefix, exclude) {
+    for (let i = 1; true; ++i) {
+        const name = `${prefix}${i}`;
+        if (!exclude.has(name))
+            return name;
+    }
+}
+function createNodeAnchors(doc, prefix) {
+    const aliasObjects = [];
+    const sourceObjects = new Map();
+    let prevAnchors = null;
+    return {
+        onAnchor: (source) => {
+            aliasObjects.push(source);
+            prevAnchors ?? (prevAnchors = anchorNames(doc));
+            const anchor = findNewAnchor(prefix, prevAnchors);
+            prevAnchors.add(anchor);
+            return anchor;
+        },
+        /**
+         * With circular references, the source node is only resolved after all
+         * of its child nodes are. This is why anchors are set only after all of
+         * the nodes have been created.
+         */
+        setAnchors: () => {
+            for (const source of aliasObjects) {
+                const ref = sourceObjects.get(source);
+                if (typeof ref === 'object' &&
+                    ref.anchor &&
+                    (identity.isScalar(ref.node) || identity.isCollection(ref.node))) {
+                    ref.node.anchor = ref.anchor;
+                }
+                else {
+                    const error = new Error('Failed to resolve repeated object (this should not happen)');
+                    error.source = source;
+                    throw error;
+                }
+            }
+        },
+        sourceObjects
+    };
+}
+
+exports.anchorIsValid = anchorIsValid;
+exports.anchorNames = anchorNames;
+exports.createNodeAnchors = createNodeAnchors;
+exports.findNewAnchor = findNewAnchor;