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/postcss/lib/processor.d.ts

@@ -0,0 +1,114 @@
+import Document from './document.js'
+import LazyResult from './lazy-result.js'
+import NoWorkResult from './no-work-result.js'
+import {
+  AcceptedPlugin,
+  Plugin,
+  ProcessOptions,
+  TransformCallback,
+  Transformer
+} from './postcss.js'
+import Result from './result.js'
+import Root from './root.js'
+
+declare namespace Processor {
+  export { Processor_ as default }
+}
+
+/**
+ * Contains plugins to process CSS. Create one `Processor` instance,
+ * initialize its plugins, and then use that instance on numerous CSS files.
+ *
+ * ```js
+ * const processor = postcss([autoprefixer, postcssNested])
+ * processor.process(css1).then(result => console.log(result.css))
+ * processor.process(css2).then(result => console.log(result.css))
+ * ```
+ */
+declare class Processor_ {
+  /**
+   * Plugins added to this processor.
+   *
+   * ```js
+   * const processor = postcss([autoprefixer, postcssNested])
+   * processor.plugins.length //=> 2
+   * ```
+   */
+  plugins: (Plugin | TransformCallback | Transformer)[]
+
+  /**
+   * Current PostCSS version.
+   *
+   * ```js
+   * if (result.processor.version.split('.')[0] !== '6') {
+   *   throw new Error('This plugin works only with PostCSS 6')
+   * }
+   * ```
+   */
+  version: string
+
+  /**
+   * @param plugins PostCSS plugins
+   */
+  constructor(plugins?: readonly AcceptedPlugin[])
+
+  /**
+   * Parses source CSS and returns a `LazyResult` Promise proxy.
+   * Because some plugins can be asynchronous it doesn’t make
+   * any transformations. Transformations will be applied
+   * in the `LazyResult` methods.
+   *
+   * ```js
+   * processor.process(css, { from: 'a.css', to: 'a.out.css' })
+   *   .then(result => {
+   *      console.log(result.css)
+   *   })
+   * ```
+   *
+   * @param css String with input CSS or any object with a `toString()` method,
+   *            like a Buffer. Optionally, send a `Result` instance
+   *            and the processor will take the `Root` from it.
+   * @param opts Options.
+   * @return Promise proxy.
+   */
+  process(
+    css: { toString(): string } | LazyResult | Result | Root | string
+  ): LazyResult | NoWorkResult
+  process<RootNode extends Document | Root = Root>(
+    css: { toString(): string } | LazyResult | Result | Root | string,
+    options: ProcessOptions<RootNode>
+  ): LazyResult<RootNode>
+
+  /**
+   * Adds a plugin to be used as a CSS processor.
+   *
+   * PostCSS plugin can be in 4 formats:
+   * * A plugin in `Plugin` format.
+   * * A plugin creator function with `pluginCreator.postcss = true`.
+   *   PostCSS will call this function without argument to get plugin.
+   * * A function. PostCSS will pass the function a {@link Root}
+   *   as the first argument and current `Result` instance
+   *   as the second.
+   * * Another `Processor` instance. PostCSS will copy plugins
+   *   from that instance into this one.
+   *
+   * Plugins can also be added by passing them as arguments when creating
+   * a `postcss` instance (see [`postcss(plugins)`]).
+   *
+   * Asynchronous plugins should return a `Promise` instance.
+   *
+   * ```js
+   * const processor = postcss()
+   *   .use(autoprefixer)
+   *   .use(postcssNested)
+   * ```
+   *
+   * @param plugin PostCSS plugin or `Processor` with plugins.
+   * @return Current processor to make methods chain.
+   */
+  use(plugin: AcceptedPlugin): this
+}
+
+declare class Processor extends Processor_ {}
+
+export = Processor