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/yaml/dist/nodes/YAMLSeq.d.ts

@@ -0,0 +1,60 @@
+import type { CreateNodeContext } from '../doc/createNode';
+import type { BlockSequence, FlowCollection } from '../parse/cst';
+import type { Schema } from '../schema/Schema';
+import type { StringifyContext } from '../stringify/stringify';
+import { Collection } from './Collection';
+import type { ParsedNode, Range } from './Node';
+import type { Pair } from './Pair';
+import type { Scalar } from './Scalar';
+import type { ToJSContext } from './toJS';
+export declare namespace YAMLSeq {
+    interface Parsed<T extends ParsedNode | Pair<ParsedNode, ParsedNode | null> = ParsedNode> extends YAMLSeq<T> {
+        items: T[];
+        range: Range;
+        srcToken?: BlockSequence | FlowCollection;
+    }
+}
+export declare class YAMLSeq<T = unknown> extends Collection {
+    static get tagName(): 'tag:yaml.org,2002:seq';
+    items: T[];
+    constructor(schema?: Schema);
+    add(value: T): void;
+    /**
+     * Removes a value from the collection.
+     *
+     * `key` must contain a representation of an integer for this to succeed.
+     * It may be wrapped in a `Scalar`.
+     *
+     * @returns `true` if the item was found and removed.
+     */
+    delete(key: unknown): boolean;
+    /**
+     * Returns item at `key`, or `undefined` if not found. By default unwraps
+     * scalar values from their surrounding node; to disable set `keepScalar` to
+     * `true` (collections are always returned intact).
+     *
+     * `key` must contain a representation of an integer for this to succeed.
+     * It may be wrapped in a `Scalar`.
+     */
+    get(key: unknown, keepScalar: true): Scalar<T> | undefined;
+    get(key: unknown, keepScalar?: false): T | undefined;
+    get(key: unknown, keepScalar?: boolean): T | Scalar<T> | undefined;
+    /**
+     * Checks if the collection includes a value with the key `key`.
+     *
+     * `key` must contain a representation of an integer for this to succeed.
+     * It may be wrapped in a `Scalar`.
+     */
+    has(key: unknown): boolean;
+    /**
+     * Sets a value in this collection. For `!!set`, `value` needs to be a
+     * boolean to add/remove the item from the set.
+     *
+     * If `key` does not contain a representation of an integer, this will throw.
+     * It may be wrapped in a `Scalar`.
+     */
+    set(key: unknown, value: T): void;
+    toJSON(_?: unknown, ctx?: ToJSContext): unknown[];
+    toString(ctx?: StringifyContext, onComment?: () => void, onChompKeep?: () => void): string;
+    static from(schema: Schema, obj: unknown, ctx: CreateNodeContext): YAMLSeq;
+}