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/items.jst

@@ -0,0 +1,98 @@
+{{# def.definitions }}
+{{# def.errors }}
+{{# def.setupKeyword }}
+{{# def.setupNextLevel }}
+
+
+{{## def.validateItems:startFrom:
+  for (var {{=$idx}} = {{=startFrom}}; {{=$idx}} < {{=$data}}.length; {{=$idx}}++) {
+    {{
+      $it.errorPath = it.util.getPathExpr(it.errorPath, $idx, it.opts.jsonPointers, true);
+      var $passData = $data + '[' + $idx + ']';
+      $it.dataPathArr[$dataNxt] = $idx;
+    }}
+
+    {{# def.generateSubschemaCode }}
+    {{# def.optimizeValidate }}
+
+    {{? $breakOnError }}
+      if (!{{=$nextValid}}) break;
+    {{?}}
+  }
+#}}
+
+{{
+  var $idx = 'i' + $lvl
+    , $dataNxt = $it.dataLevel = it.dataLevel + 1
+    , $nextData = 'data' + $dataNxt
+    , $currentBaseId = it.baseId;
+}}
+
+var {{=$errs}} = errors;
+var {{=$valid}};
+
+{{? Array.isArray($schema) }}
+  {{ /* 'items' is an array of schemas */}}
+  {{ var $additionalItems = it.schema.additionalItems; }}
+  {{? $additionalItems === false }}
+    {{=$valid}} = {{=$data}}.length <= {{= $schema.length }};
+    {{
+      var $currErrSchemaPath = $errSchemaPath;
+      $errSchemaPath = it.errSchemaPath + '/additionalItems';      
+    }}
+    {{# def.checkError:'additionalItems' }}
+    {{ $errSchemaPath = $currErrSchemaPath; }}
+    {{# def.elseIfValid}}
+  {{?}}
+
+  {{~ $schema:$sch:$i }}
+    {{? {{# def.nonEmptySchema:$sch }} }}
+      {{=$nextValid}} = true;
+
+      if ({{=$data}}.length > {{=$i}}) {
+        {{
+          var $passData = $data + '[' + $i + ']';
+          $it.schema = $sch;
+          $it.schemaPath = $schemaPath + '[' + $i + ']';
+          $it.errSchemaPath = $errSchemaPath + '/' + $i;
+          $it.errorPath = it.util.getPathExpr(it.errorPath, $i, it.opts.jsonPointers, true);
+          $it.dataPathArr[$dataNxt] = $i;
+        }}
+
+        {{# def.generateSubschemaCode }}
+        {{# def.optimizeValidate }}
+      }
+
+      {{# def.ifResultValid }}
+    {{?}}
+  {{~}}
+
+  {{? typeof $additionalItems == 'object' && {{# def.nonEmptySchema:$additionalItems }} }}
+    {{
+      $it.schema = $additionalItems;
+      $it.schemaPath = it.schemaPath + '.additionalItems';
+      $it.errSchemaPath = it.errSchemaPath + '/additionalItems';
+    }}
+    {{=$nextValid}} = true;
+
+    if ({{=$data}}.length > {{= $schema.length }}) {
+      {{# def.validateItems: $schema.length }}
+    }
+
+    {{# def.ifResultValid }}
+  {{?}}
+
+{{?? {{# def.nonEmptySchema:$schema }} }}
+  {{ /* 'items' is a single schema */}}
+  {{
+    $it.schema = $schema;
+    $it.schemaPath = $schemaPath;
+    $it.errSchemaPath = $errSchemaPath;
+  }}
+  {{# def.validateItems: 0 }}
+{{?}}
+
+{{? $breakOnError }}
+  {{= $closingBraces }}
+  if ({{=$errs}} == errors) {
+{{?}}