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/@lucide/svelte/dist/icons/brain-circuit.svelte.d.ts

@@ -0,0 +1,16 @@
+/**
+ * @file
+ * @license @lucide/svelte v1.28.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+/**
+ * Lucide SVG icon component, renders SVG Element with children.
+ *
+ * @preview ![img](data:image/svg+xml;base64,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) - https://lucide.dev/icons/brain-circuit
+ * @see https://lucide.dev/guide/packages/lucide-svelte - Documentation
+ */
+declare const BrainCircuit: import("svelte").Component<import("../types.js").LucideProps, {}, "">;
+type BrainCircuit = ReturnType<typeof BrainCircuit>;
+export default BrainCircuit;