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/yocto-queue/index.js

@@ -0,0 +1,68 @@
+class Node {
+	/// value;
+	/// next;
+
+	constructor(value) {
+		this.value = value;
+
+		// TODO: Remove this when targeting Node.js 12.
+		this.next = undefined;
+	}
+}
+
+class Queue {
+	// TODO: Use private class fields when targeting Node.js 12.
+	// #_head;
+	// #_tail;
+	// #_size;
+
+	constructor() {
+		this.clear();
+	}
+
+	enqueue(value) {
+		const node = new Node(value);
+
+		if (this._head) {
+			this._tail.next = node;
+			this._tail = node;
+		} else {
+			this._head = node;
+			this._tail = node;
+		}
+
+		this._size++;
+	}
+
+	dequeue() {
+		const current = this._head;
+		if (!current) {
+			return;
+		}
+
+		this._head = this._head.next;
+		this._size--;
+		return current.value;
+	}
+
+	clear() {
+		this._head = undefined;
+		this._tail = undefined;
+		this._size = 0;
+	}
+
+	get size() {
+		return this._size;
+	}
+
+	* [Symbol.iterator]() {
+		let current = this._head;
+
+		while (current) {
+			yield current.value;
+			current = current.next;
+		}
+	}
+}
+
+module.exports = Queue;