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/float.js

@@ -0,0 +1,50 @@
+'use strict';
+
+var Scalar = require('../../nodes/Scalar.js');
+var stringifyNumber = require('../../stringify/stringifyNumber.js');
+
+const floatNaN = {
+    identify: value => typeof value === 'number',
+    default: true,
+    tag: 'tag:yaml.org,2002:float',
+    test: /^(?:[-+]?\.(?:inf|Inf|INF)|\.nan|\.NaN|\.NAN)$/,
+    resolve: (str) => str.slice(-3).toLowerCase() === 'nan'
+        ? NaN
+        : str[0] === '-'
+            ? Number.NEGATIVE_INFINITY
+            : Number.POSITIVE_INFINITY,
+    stringify: stringifyNumber.stringifyNumber
+};
+const floatExp = {
+    identify: value => typeof value === 'number',
+    default: true,
+    tag: 'tag:yaml.org,2002:float',
+    format: 'EXP',
+    test: /^[-+]?(?:[0-9][0-9_]*)?(?:\.[0-9_]*)?[eE][-+]?[0-9]+$/,
+    resolve: (str) => parseFloat(str.replace(/_/g, '')),
+    stringify(node) {
+        const num = Number(node.value);
+        return isFinite(num) ? num.toExponential() : stringifyNumber.stringifyNumber(node);
+    }
+};
+const float = {
+    identify: value => typeof value === 'number',
+    default: true,
+    tag: 'tag:yaml.org,2002:float',
+    test: /^[-+]?(?:[0-9][0-9_]*)?\.[0-9_]*$/,
+    resolve(str) {
+        const node = new Scalar.Scalar(parseFloat(str.replace(/_/g, '')));
+        const dot = str.indexOf('.');
+        if (dot !== -1) {
+            const f = str.substring(dot + 1).replace(/_/g, '');
+            if (f[f.length - 1] === '0')
+                node.minFractionDigits = f.length;
+        }
+        return node;
+    },
+    stringify: stringifyNumber.stringifyNumber
+};
+
+exports.float = float;
+exports.floatExp = floatExp;
+exports.floatNaN = floatNaN;