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/animations-complete.js

@@ -0,0 +1,102 @@
+import { afterTick, onDestroyEffect } from "svelte-toolbelt";
+export class AnimationsComplete {
+    #opts;
+    #currentFrame = null;
+    #observer = null;
+    #runId = 0;
+    constructor(opts) {
+        this.#opts = opts;
+        onDestroyEffect(() => this.#cleanup());
+    }
+    #cleanup() {
+        if (this.#currentFrame !== null) {
+            window.cancelAnimationFrame(this.#currentFrame);
+            this.#currentFrame = null;
+        }
+        this.#observer?.disconnect();
+        this.#observer = null;
+        this.#runId++;
+    }
+    run(fn) {
+        this.#cleanup();
+        const node = this.#opts.ref.current;
+        if (!node)
+            return;
+        if (typeof node.getAnimations !== "function") {
+            this.#executeCallback(fn);
+            return;
+        }
+        const runId = this.#runId;
+        const executeIfCurrent = () => {
+            if (runId !== this.#runId)
+                return;
+            this.#executeCallback(fn);
+        };
+        const waitForAnimations = () => {
+            if (runId !== this.#runId)
+                return;
+            const animations = node.getAnimations();
+            if (animations.length === 0) {
+                executeIfCurrent();
+                return;
+            }
+            Promise.all(animations.map((animation) => animation.finished))
+                .then(() => {
+                executeIfCurrent();
+            })
+                .catch(() => {
+                if (runId !== this.#runId)
+                    return;
+                const currentAnimations = node.getAnimations();
+                const hasRunningAnimations = currentAnimations.some((animation) => animation.pending || animation.playState !== "finished");
+                if (hasRunningAnimations) {
+                    waitForAnimations();
+                    return;
+                }
+                executeIfCurrent();
+            });
+        };
+        const requestWaitForAnimations = () => {
+            this.#currentFrame = window.requestAnimationFrame(() => {
+                this.#currentFrame = null;
+                waitForAnimations();
+            });
+        };
+        if (!this.#opts.afterTick.current) {
+            requestWaitForAnimations();
+            return;
+        }
+        this.#currentFrame = window.requestAnimationFrame(() => {
+            this.#currentFrame = null;
+            const startingStyleAttr = "data-starting-style";
+            if (!node.hasAttribute(startingStyleAttr)) {
+                requestWaitForAnimations();
+                return;
+            }
+            this.#observer = new MutationObserver(() => {
+                if (runId !== this.#runId)
+                    return;
+                if (node.hasAttribute(startingStyleAttr))
+                    return;
+                this.#observer?.disconnect();
+                this.#observer = null;
+                requestWaitForAnimations();
+            });
+            this.#observer.observe(node, {
+                attributes: true,
+                attributeFilter: [startingStyleAttr],
+            });
+        });
+    }
+    #executeCallback(fn) {
+        const execute = () => {
+            fn();
+        };
+        if (this.#opts.afterTick) {
+            afterTick(execute);
+        }
+        else {
+            execute();
+        }
+    }
+}