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/ajv/scripts/travis-gh-pages

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -e
+
+if [[ "$TRAVIS_BRANCH" == "master" && "$TRAVIS_PULL_REQUEST" == "false" && $TRAVIS_JOB_NUMBER =~ ".3" ]]; then
+  git diff --name-only $TRAVIS_COMMIT_RANGE | grep -qE '\.md$|^LICENSE$|travis-gh-pages$' && {
+    rm -rf ../gh-pages
+    git clone -b gh-pages --single-branch https://${GITHUB_TOKEN}@github.com/ajv-validator/ajv.git ../gh-pages
+    mkdir -p ../gh-pages/_source
+    cp *.md ../gh-pages/_source
+    cp LICENSE ../gh-pages/_source
+    currentDir=$(pwd)
+    cd ../gh-pages
+    $currentDir/node_modules/.bin/gh-pages-generator
+    # remove logo from README
+    sed -i -E "s/<img[^>]+ajv_logo[^>]+>//" index.md
+    git config user.email "$GIT_USER_EMAIL"
+    git config user.name "$GIT_USER_NAME"
+    git add .
+    git commit -am "updated by travis build #$TRAVIS_BUILD_NUMBER"
+    git push --quiet origin gh-pages > /dev/null 2>&1
+  }
+fi