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/schema/Schema.js

@@ -0,0 +1,39 @@
+'use strict';
+
+var identity = require('../nodes/identity.js');
+var map = require('./common/map.js');
+var seq = require('./common/seq.js');
+var string = require('./common/string.js');
+var tags = require('./tags.js');
+
+const sortMapEntriesByKey = (a, b) => a.key < b.key ? -1 : a.key > b.key ? 1 : 0;
+class Schema {
+    constructor({ compat, customTags, merge, resolveKnownTags, schema, sortMapEntries, toStringDefaults }) {
+        this.compat = Array.isArray(compat)
+            ? tags.getTags(compat, 'compat')
+            : compat
+                ? tags.getTags(null, compat)
+                : null;
+        this.name = (typeof schema === 'string' && schema) || 'core';
+        this.knownTags = resolveKnownTags ? tags.coreKnownTags : {};
+        this.tags = tags.getTags(customTags, this.name, merge);
+        this.toStringOptions = toStringDefaults ?? null;
+        Object.defineProperty(this, identity.MAP, { value: map.map });
+        Object.defineProperty(this, identity.SCALAR, { value: string.string });
+        Object.defineProperty(this, identity.SEQ, { value: seq.seq });
+        // Used by createMap()
+        this.sortMapEntries =
+            typeof sortMapEntries === 'function'
+                ? sortMapEntries
+                : sortMapEntries === true
+                    ? sortMapEntriesByKey
+                    : null;
+    }
+    clone() {
+        const copy = Object.create(Schema.prototype, Object.getOwnPropertyDescriptors(this));
+        copy.tags = this.tags.slice();
+        return copy;
+    }
+}
+
+exports.Schema = Schema;