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/bits-ui/dist/internal/events.js

@@ -0,0 +1,32 @@
+import { on } from "svelte/events";
+/**
+ * Creates a typed event dispatcher and listener pair for custom events
+ * @template T - The type of data that will be passed in the event detail
+ * @param eventName - The name of the custom event
+ * @param options - CustomEvent options (bubbles, cancelable, etc.)
+ */
+export class CustomEventDispatcher {
+    eventName;
+    options;
+    constructor(eventName, options = { bubbles: true, cancelable: true }) {
+        this.eventName = eventName;
+        this.options = options;
+    }
+    createEvent(detail) {
+        return new CustomEvent(this.eventName, {
+            ...this.options,
+            detail,
+        });
+    }
+    dispatch(element, detail) {
+        const event = this.createEvent(detail);
+        element.dispatchEvent(event);
+        return event;
+    }
+    listen(element, callback, options) {
+        const handler = (event) => {
+            callback(event);
+        };
+        return on(element, this.eventName, handler, options);
+    }
+}