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/no-work-result.js

@@ -0,0 +1,137 @@
+'use strict'
+
+let MapGenerator = require('./map-generator')
+let parse = require('./parse')
+let Result = require('./result')
+let stringify = require('./stringify')
+let warnOnce = require('./warn-once')
+
+class NoWorkResult {
+  get content() {
+    return this.result.css
+  }
+
+  get css() {
+    return this.result.css
+  }
+
+  get map() {
+    return this.result.map
+  }
+
+  get messages() {
+    return []
+  }
+
+  get opts() {
+    return this.result.opts
+  }
+
+  get processor() {
+    return this.result.processor
+  }
+
+  get root() {
+    if (this._root) {
+      return this._root
+    }
+
+    let root
+    let parser = parse
+
+    try {
+      root = parser(this._css, this._opts)
+    } catch (error) {
+      this.error = error
+    }
+
+    if (this.error) {
+      throw this.error
+    } else {
+      this._root = root
+      return root
+    }
+  }
+
+  get [Symbol.toStringTag]() {
+    return 'NoWorkResult'
+  }
+
+  constructor(processor, css, opts) {
+    css = css.toString()
+    this.stringified = false
+
+    this._processor = processor
+    this._css = css
+    this._opts = opts
+    this._map = undefined
+
+    let str = stringify
+    this.result = new Result(this._processor, undefined, this._opts)
+    this.result.css = css
+
+    let self = this
+    Object.defineProperty(this.result, 'root', {
+      get() {
+        return self.root
+      }
+    })
+
+    let map = new MapGenerator(str, undefined, this._opts, css)
+    if (map.isMap()) {
+      let [generatedCSS, generatedMap] = map.generate()
+      if (generatedCSS) {
+        this.result.css = generatedCSS
+      }
+      if (generatedMap) {
+        this.result.map = generatedMap
+      }
+    } else {
+      map.clearAnnotation()
+      this.result.css = map.css
+    }
+  }
+
+  async() {
+    if (this.error) return Promise.reject(this.error)
+    return Promise.resolve(this.result)
+  }
+
+  catch(onRejected) {
+    return this.async().catch(onRejected)
+  }
+
+  finally(onFinally) {
+    return this.async().then(onFinally, onFinally)
+  }
+
+  sync() {
+    if (this.error) throw this.error
+    return this.result
+  }
+
+  then(onFulfilled, onRejected) {
+    if (process.env.NODE_ENV !== 'production') {
+      if (!('from' in this._opts)) {
+        warnOnce(
+          'Without `from` option PostCSS could generate wrong source map ' +
+            'and will not find Browserslist config. Set it to CSS file path ' +
+            'or to `undefined` to prevent this warning.'
+        )
+      }
+    }
+
+    return this.async().then(onFulfilled, onRejected)
+  }
+
+  toString() {
+    return this._css
+  }
+
+  warnings() {
+    return []
+  }
+}
+
+module.exports = NoWorkResult
+NoWorkResult.default = NoWorkResult