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/parse5/dist/parser/open-element-stack.d.ts

@@ -0,0 +1,53 @@
+import { TAG_ID as $ } from '../common/html.js';
+import type { TreeAdapter, TreeAdapterTypeMap } from '../tree-adapters/interface.js';
+export interface StackHandler<T extends TreeAdapterTypeMap> {
+    onItemPush: (node: T['parentNode'], tid: number, isTop: boolean) => void;
+    onItemPop: (node: T['parentNode'], isTop: boolean) => void;
+}
+export declare class OpenElementStack<T extends TreeAdapterTypeMap> {
+    private treeAdapter;
+    private handler;
+    items: T['parentNode'][];
+    tagIDs: $[];
+    current: T['parentNode'] | undefined;
+    stackTop: number;
+    tmplCount: number;
+    currentTagId: number | undefined;
+    get currentTmplContentOrNode(): T['parentNode'];
+    constructor(document: T['document'], treeAdapter: TreeAdapter<T>, handler: StackHandler<T>);
+    private _indexOf;
+    private _isInTemplate;
+    private _updateCurrentElement;
+    push(element: T['element'], tagID: $): void;
+    pop(): void;
+    replace(oldElement: T['element'], newElement: T['element']): void;
+    insertAfter(referenceElement: T['element'], newElement: T['element'], newElementID: $): void;
+    popUntilTagNamePopped(tagName: $): void;
+    shortenToLength(idx: number): void;
+    popUntilElementPopped(element: T['element']): void;
+    private popUntilPopped;
+    popUntilNumberedHeaderPopped(): void;
+    popUntilTableCellPopped(): void;
+    popAllUpToHtmlElement(): void;
+    private _indexOfTagNames;
+    private clearBackTo;
+    clearBackToTableContext(): void;
+    clearBackToTableBodyContext(): void;
+    clearBackToTableRowContext(): void;
+    remove(element: T['element']): void;
+    tryPeekProperlyNestedBodyElement(): T['element'] | null;
+    contains(element: T['element']): boolean;
+    getCommonAncestor(element: T['element']): T['element'] | null;
+    isRootHtmlElementCurrent(): boolean;
+    private hasInDynamicScope;
+    hasInScope(tagName: $): boolean;
+    hasInListItemScope(tagName: $): boolean;
+    hasInButtonScope(tagName: $): boolean;
+    hasNumberedHeaderInScope(): boolean;
+    hasInTableScope(tagName: $): boolean;
+    hasTableBodyContextInTableScope(): boolean;
+    hasInSelectScope(tagName: $): boolean;
+    generateImpliedEndTags(): void;
+    generateImpliedEndTagsThoroughly(): void;
+    generateImpliedEndTagsWithExclusion(exclusionId: $): void;
+}