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/browser/dist/compose/compose-node.js

@@ -0,0 +1,109 @@
+import { Alias } from '../nodes/Alias.js';
+import { isScalar } from '../nodes/identity.js';
+import { composeCollection } from './compose-collection.js';
+import { composeScalar } from './compose-scalar.js';
+import { resolveEnd } from './resolve-end.js';
+import { emptyScalarPosition } from './util-empty-scalar-position.js';
+
+const CN = { composeNode, composeEmptyNode };
+function composeNode(ctx, token, props, onError) {
+    const atKey = ctx.atKey;
+    const { spaceBefore, comment, anchor, tag } = props;
+    let node;
+    let isSrcToken = true;
+    switch (token.type) {
+        case 'alias':
+            node = composeAlias(ctx, token, onError);
+            if (anchor || tag)
+                onError(token, 'ALIAS_PROPS', 'An alias node must not specify any properties');
+            break;
+        case 'scalar':
+        case 'single-quoted-scalar':
+        case 'double-quoted-scalar':
+        case 'block-scalar':
+            node = composeScalar(ctx, token, tag, onError);
+            if (anchor)
+                node.anchor = anchor.source.substring(1);
+            break;
+        case 'block-map':
+        case 'block-seq':
+        case 'flow-collection':
+            try {
+                node = composeCollection(CN, ctx, token, props, onError);
+                if (anchor)
+                    node.anchor = anchor.source.substring(1);
+            }
+            catch (error) {
+                // Almost certainly here due to a stack overflow
+                const message = error instanceof Error ? error.message : String(error);
+                onError(token, 'RESOURCE_EXHAUSTION', message);
+            }
+            break;
+        default: {
+            const message = token.type === 'error'
+                ? token.message
+                : `Unsupported token (type: ${token.type})`;
+            onError(token, 'UNEXPECTED_TOKEN', message);
+            isSrcToken = false;
+        }
+    }
+    node ?? (node = composeEmptyNode(ctx, token.offset, undefined, null, props, onError));
+    if (anchor && node.anchor === '')
+        onError(anchor, 'BAD_ALIAS', 'Anchor cannot be an empty string');
+    if (atKey &&
+        ctx.options.stringKeys &&
+        (!isScalar(node) ||
+            typeof node.value !== 'string' ||
+            (node.tag && node.tag !== 'tag:yaml.org,2002:str'))) {
+        const msg = 'With stringKeys, all keys must be strings';
+        onError(tag ?? token, 'NON_STRING_KEY', msg);
+    }
+    if (spaceBefore)
+        node.spaceBefore = true;
+    if (comment) {
+        if (token.type === 'scalar' && token.source === '')
+            node.comment = comment;
+        else
+            node.commentBefore = comment;
+    }
+    // @ts-expect-error Type checking misses meaning of isSrcToken
+    if (ctx.options.keepSourceTokens && isSrcToken)
+        node.srcToken = token;
+    return node;
+}
+function composeEmptyNode(ctx, offset, before, pos, { spaceBefore, comment, anchor, tag, end }, onError) {
+    const token = {
+        type: 'scalar',
+        offset: emptyScalarPosition(offset, before, pos),
+        indent: -1,
+        source: ''
+    };
+    const node = composeScalar(ctx, token, tag, onError);
+    if (anchor) {
+        node.anchor = anchor.source.substring(1);
+        if (node.anchor === '')
+            onError(anchor, 'BAD_ALIAS', 'Anchor cannot be an empty string');
+    }
+    if (spaceBefore)
+        node.spaceBefore = true;
+    if (comment) {
+        node.comment = comment;
+        node.range[2] = end;
+    }
+    return node;
+}
+function composeAlias({ options }, { offset, source, end }, onError) {
+    const alias = new Alias(source.substring(1));
+    if (alias.source === '')
+        onError(offset, 'BAD_ALIAS', 'Alias cannot be an empty string');
+    if (alias.source.endsWith(':'))
+        onError(offset + source.length - 1, 'BAD_ALIAS', 'Alias ending in : is ambiguous', true);
+    const valueEnd = offset + source.length;
+    const re = resolveEnd(end, valueEnd, options.strict, onError);
+    alias.range = [offset, valueEnd, re.offset];
+    if (re.comment)
+        alias.comment = re.comment;
+    return alias;
+}
+
+export { composeEmptyNode, composeNode };