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/ajv/lib/dot/required.jst

@@ -0,0 +1,108 @@
+{{# def.definitions }}
+{{# def.errors }}
+{{# def.missing }}
+{{# def.setupKeyword }}
+{{# def.$data }}
+
+{{ var $vSchema = 'schema' + $lvl; }}
+
+{{## def.setupLoop:
+  {{? !$isData }}
+    var {{=$vSchema}} = validate.schema{{=$schemaPath}};
+  {{?}}
+
+  {{
+    var $i = 'i' + $lvl
+      , $propertyPath = 'schema' + $lvl + '[' + $i + ']'
+      , $missingProperty = '\' + ' + $propertyPath + ' + \'';
+    if (it.opts._errorDataPathProperty) {
+      it.errorPath = it.util.getPathExpr($currentErrorPath, $propertyPath, it.opts.jsonPointers);
+    }
+  }}
+#}}
+
+
+{{## def.isRequiredOwnProperty:
+  Object.prototype.hasOwnProperty.call({{=$data}}, {{=$vSchema}}[{{=$i}}])
+#}}
+
+
+{{? !$isData }}
+  {{? $schema.length < it.opts.loopRequired &&
+      it.schema.properties && Object.keys(it.schema.properties).length }}
+    {{ var $required = []; }}
+    {{~ $schema:$property }}
+      {{ var $propertySch = it.schema.properties[$property]; }}
+      {{? !($propertySch && {{# def.nonEmptySchema:$propertySch}}) }}
+        {{ $required[$required.length] = $property; }}
+      {{?}}
+    {{~}}
+  {{??}}
+    {{ var $required = $schema; }}
+  {{?}}
+{{?}}
+
+
+{{? $isData || $required.length }}
+  {{
+    var $currentErrorPath = it.errorPath
+      , $loopRequired = $isData || $required.length >= it.opts.loopRequired
+      , $ownProperties = it.opts.ownProperties;
+  }}
+
+  {{? $breakOnError }}
+    var missing{{=$lvl}};
+    {{? $loopRequired }}
+      {{# def.setupLoop }}
+      var {{=$valid}} = true;
+
+      {{?$isData}}{{# def.check$dataIsArray }}{{?}}
+
+      for (var {{=$i}} = 0; {{=$i}} < {{=$vSchema}}.length; {{=$i}}++) {
+        {{=$valid}} = {{=$data}}[{{=$vSchema}}[{{=$i}}]] !== undefined
+                      {{? $ownProperties }}
+                        && {{# def.isRequiredOwnProperty }}
+                      {{?}};
+        if (!{{=$valid}}) break;
+      }
+
+      {{? $isData }}  }  {{?}}
+
+      {{# def.checkError:'required' }}
+      else {
+    {{??}}
+      if ({{# def.checkMissingProperty:$required }}) {
+        {{# def.errorMissingProperty:'required' }}
+      } else {
+    {{?}}
+  {{??}}
+    {{? $loopRequired }}
+      {{# def.setupLoop }}
+      {{? $isData }}
+        if ({{=$vSchema}} && !Array.isArray({{=$vSchema}})) {
+          {{# def.addError:'required' }}
+        } else if ({{=$vSchema}} !== undefined) {
+      {{?}}
+
+      for (var {{=$i}} = 0; {{=$i}} < {{=$vSchema}}.length; {{=$i}}++) {
+        if ({{=$data}}[{{=$vSchema}}[{{=$i}}]] === undefined
+            {{? $ownProperties }}
+              || !{{# def.isRequiredOwnProperty }}
+            {{?}}) {
+          {{# def.addError:'required' }}
+        }
+      }
+
+      {{? $isData }}  }  {{?}}
+    {{??}}
+      {{~ $required:$propertyKey }}
+        {{# def.allErrorsMissingProperty:'required' }}
+      {{~}}
+    {{?}}
+  {{?}}
+
+  {{ it.errorPath = $currentErrorPath; }}
+
+{{?? $breakOnError }}
+  if (true) {
+{{?}}