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/compose/compose-doc.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var Document = require('../doc/Document.js');
+var composeNode = require('./compose-node.js');
+var resolveEnd = require('./resolve-end.js');
+var resolveProps = require('./resolve-props.js');
+
+function composeDoc(options, directives, { offset, start, value, end }, onError) {
+    const opts = Object.assign({ _directives: directives }, options);
+    const doc = new Document.Document(undefined, opts);
+    const ctx = {
+        atKey: false,
+        atRoot: true,
+        directives: doc.directives,
+        options: doc.options,
+        schema: doc.schema
+    };
+    const props = resolveProps.resolveProps(start, {
+        indicator: 'doc-start',
+        next: value ?? end?.[0],
+        offset,
+        onError,
+        parentIndent: 0,
+        startOnNewline: true
+    });
+    if (props.found) {
+        doc.directives.docStart = true;
+        if (value &&
+            (value.type === 'block-map' || value.type === 'block-seq') &&
+            !props.hasNewline)
+            onError(props.end, 'MISSING_CHAR', 'Block collection cannot start on same line with directives-end marker');
+    }
+    // @ts-expect-error If Contents is set, let's trust the user
+    doc.contents = value
+        ? composeNode.composeNode(ctx, value, props, onError)
+        : composeNode.composeEmptyNode(ctx, props.end, start, null, props, onError);
+    const contentEnd = doc.contents.range[2];
+    const re = resolveEnd.resolveEnd(end, contentEnd, false, onError);
+    if (re.comment)
+        doc.comment = re.comment;
+    doc.range = [offset, contentEnd, re.offset];
+    return doc;
+}
+
+exports.composeDoc = composeDoc;