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/yaml-1.1/pairs.js

@@ -0,0 +1,82 @@
+'use strict';
+
+var identity = require('../../nodes/identity.js');
+var Pair = require('../../nodes/Pair.js');
+var Scalar = require('../../nodes/Scalar.js');
+var YAMLSeq = require('../../nodes/YAMLSeq.js');
+
+function resolvePairs(seq, onError) {
+    if (identity.isSeq(seq)) {
+        for (let i = 0; i < seq.items.length; ++i) {
+            let item = seq.items[i];
+            if (identity.isPair(item))
+                continue;
+            else if (identity.isMap(item)) {
+                if (item.items.length > 1)
+                    onError('Each pair must have its own sequence indicator');
+                const pair = item.items[0] || new Pair.Pair(new Scalar.Scalar(null));
+                if (item.commentBefore)
+                    pair.key.commentBefore = pair.key.commentBefore
+                        ? `${item.commentBefore}\n${pair.key.commentBefore}`
+                        : item.commentBefore;
+                if (item.comment) {
+                    const cn = pair.value ?? pair.key;
+                    cn.comment = cn.comment
+                        ? `${item.comment}\n${cn.comment}`
+                        : item.comment;
+                }
+                item = pair;
+            }
+            seq.items[i] = identity.isPair(item) ? item : new Pair.Pair(item);
+        }
+    }
+    else
+        onError('Expected a sequence for this tag');
+    return seq;
+}
+function createPairs(schema, iterable, ctx) {
+    const { replacer } = ctx;
+    const pairs = new YAMLSeq.YAMLSeq(schema);
+    pairs.tag = 'tag:yaml.org,2002:pairs';
+    let i = 0;
+    if (iterable && Symbol.iterator in Object(iterable))
+        for (let it of iterable) {
+            if (typeof replacer === 'function')
+                it = replacer.call(iterable, String(i++), it);
+            let key, value;
+            if (Array.isArray(it)) {
+                if (it.length === 2) {
+                    key = it[0];
+                    value = it[1];
+                }
+                else
+                    throw new TypeError(`Expected [key, value] tuple: ${it}`);
+            }
+            else if (it && it instanceof Object) {
+                const keys = Object.keys(it);
+                if (keys.length === 1) {
+                    key = keys[0];
+                    value = it[key];
+                }
+                else {
+                    throw new TypeError(`Expected tuple with one key, not ${keys.length} keys`);
+                }
+            }
+            else {
+                key = it;
+            }
+            pairs.items.push(Pair.createPair(key, value, ctx));
+        }
+    return pairs;
+}
+const pairs = {
+    collection: 'seq',
+    default: false,
+    tag: 'tag:yaml.org,2002:pairs',
+    resolve: resolvePairs,
+    createNode: createPairs
+};
+
+exports.createPairs = createPairs;
+exports.pairs = pairs;
+exports.resolvePairs = resolvePairs;