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/asynckit/lib/readable_asynckit.js

@@ -0,0 +1,91 @@
+var streamify = require('./streamify.js')
+  , defer     = require('./defer.js')
+  ;
+
+// API
+module.exports = ReadableAsyncKit;
+
+/**
+ * Base constructor for all streams
+ * used to hold properties/methods
+ */
+function ReadableAsyncKit()
+{
+  ReadableAsyncKit.super_.apply(this, arguments);
+
+  // list of active jobs
+  this.jobs = {};
+
+  // add stream methods
+  this.destroy = destroy;
+  this._start  = _start;
+  this._read   = _read;
+}
+
+/**
+ * Destroys readable stream,
+ * by aborting outstanding jobs
+ *
+ * @returns {void}
+ */
+function destroy()
+{
+  if (this.destroyed)
+  {
+    return;
+  }
+
+  this.destroyed = true;
+
+  if (typeof this.terminator == 'function')
+  {
+    this.terminator();
+  }
+}
+
+/**
+ * Starts provided jobs in async manner
+ *
+ * @private
+ */
+function _start()
+{
+  // first argument – runner function
+  var runner = arguments[0]
+    // take away first argument
+    , args   = Array.prototype.slice.call(arguments, 1)
+      // second argument - input data
+    , input  = args[0]
+      // last argument - result callback
+    , endCb  = streamify.callback.call(this, args[args.length - 1])
+    ;
+
+  args[args.length - 1] = endCb;
+  // third argument - iterator
+  args[1] = streamify.iterator.call(this, args[1]);
+
+  // allow time for proper setup
+  defer(function()
+  {
+    if (!this.destroyed)
+    {
+      this.terminator = runner.apply(null, args);
+    }
+    else
+    {
+      endCb(null, Array.isArray(input) ? [] : {});
+    }
+  }.bind(this));
+}
+
+
+/**
+ * Implement _read to comply with Readable streams
+ * Doesn't really make sense for flowing object mode
+ *
+ * @private
+ */
+function _read()
+{
+
+}