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/tinyexec/package.json

@@ -0,0 +1,66 @@
+{
+  "name": "tinyexec",
+  "version": "0.3.2",
+  "type": "module",
+  "description": "A minimal library for executing processes in Node",
+  "main": "./dist/main.js",
+  "files": [
+    "dist",
+    "!dist/node_modules",
+    "!dist/cjs/test",
+    "!dist/esm/test"
+  ],
+  "scripts": {
+    "build": "npm run build:types && tsup",
+    "build:types": "tsc",
+    "dev": "tsup --watch",
+    "format": "prettier --write src",
+    "format:check": "prettier --check src",
+    "lint": "eslint src",
+    "prepare": "npm run build",
+    "test": "npm run build && c8 node --test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/tinylibs/tinyexec.git"
+  },
+  "keywords": [
+    "execa",
+    "exec",
+    "tiny",
+    "child_process",
+    "spawn"
+  ],
+  "author": "James Garbutt (https://github.com/43081j)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/tinylibs/tinyexec/issues"
+  },
+  "homepage": "https://github.com/tinylibs/tinyexec#readme",
+  "devDependencies": {
+    "@eslint/js": "^9.0.0",
+    "@types/cross-spawn": "^6.0.6",
+    "@types/node": "^20.12.7",
+    "c8": "^9.1.0",
+    "cross-spawn": "^7.0.3",
+    "eslint-config-google": "^0.14.0",
+    "prettier": "^3.2.5",
+    "tsup": "^8.1.0",
+    "typescript": "^5.4.5",
+    "typescript-eslint": "^7.7.0"
+  },
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./dist/main.d.ts",
+        "default": "./dist/main.js"
+      },
+      "require": {
+        "types": "./dist/main.d.cts",
+        "default": "./dist/main.cjs"
+      }
+    },
+    "./package.json": "./package.json"
+  },
+  "types": "./dist/main.d.ts"
+}