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/runed/dist/utilities/context/context.d.ts

@@ -0,0 +1,42 @@
+export declare class Context<TContext> {
+    #private;
+    /**
+     * @param name The name of the context.
+     * This is used for generating the context key and error messages.
+     */
+    constructor(name: string);
+    /**
+     * The key used to get and set the context.
+     *
+     * It is not recommended to use this value directly.
+     * Instead, use the methods provided by this class.
+     */
+    get key(): symbol;
+    /**
+     * Checks whether this has been set in the context of a parent component.
+     *
+     * Must be called during component initialisation.
+     */
+    exists(): boolean;
+    /**
+     * Retrieves the context that belongs to the closest parent component.
+     *
+     * Must be called during component initialisation.
+     *
+     * @throws An error if the context does not exist.
+     */
+    get(): TContext;
+    /**
+     * Retrieves the context that belongs to the closest parent component,
+     * or the given fallback value if the context does not exist.
+     *
+     * Must be called during component initialisation.
+     */
+    getOr<TFallback>(fallback: TFallback): TContext | TFallback;
+    /**
+     * Associates the given value with the current component and returns it.
+     *
+     * Must be called during component initialisation.
+     */
+    set(context: TContext): TContext;
+}