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/eslint-plugin-svelte/lib/rules/no-immutable-reactive-statements.js

@@ -0,0 +1,180 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const utils_1 = require("../utils");
+const ast_utils_1 = require("../utils/ast-utils");
+const compat_1 = require("../utils/compat");
+exports.default = (0, utils_1.createRule)('no-immutable-reactive-statements', {
+    meta: {
+        docs: {
+            description: "disallow reactive statements that don't reference reactive values.",
+            category: 'Best Practices',
+            // TODO Switch to recommended in the major version.
+            recommended: false
+        },
+        schema: [],
+        messages: {
+            immutable: 'This statement is not reactive because all variables referenced in the reactive statement are immutable.'
+        },
+        type: 'suggestion'
+    },
+    create(context) {
+        const scopeManager = (0, compat_1.getSourceCode)(context).scopeManager;
+        const globalScope = scopeManager.globalScope;
+        const toplevelScope = globalScope?.childScopes.find((scope) => scope.type === 'module') || globalScope;
+        if (!globalScope || !toplevelScope) {
+            return {};
+        }
+        const cacheMutableVariable = new WeakMap();
+        /**
+         * Checks whether the given reference is a mutable variable or not.
+         */
+        function isMutableVariableReference(reference) {
+            if (reference.identifier.name.startsWith('$')) {
+                // It is reactive store reference.
+                return true;
+            }
+            if (!reference.resolved) {
+                // Unknown variable
+                return true;
+            }
+            return isMutableVariable(reference.resolved);
+        }
+        /**
+         * Checks whether the given variable is a mutable variable or not.
+         */
+        function isMutableVariable(variable) {
+            const cache = cacheMutableVariable.get(variable);
+            if (cache != null) {
+                return cache;
+            }
+            if (variable.defs.length === 0) {
+                // Global variables are assumed to be immutable.
+                return true;
+            }
+            const isMutableDefine = variable.defs.some((def) => {
+                if (def.type === 'ImportBinding') {
+                    return false;
+                }
+                if (def.node.type === 'AssignmentExpression') {
+                    // Reactive values
+                    return true;
+                }
+                if (def.type === 'Variable') {
+                    const parent = def.parent;
+                    if (parent.kind === 'const') {
+                        if (def.node.init &&
+                            (def.node.init.type === 'FunctionExpression' ||
+                                def.node.init.type === 'ArrowFunctionExpression' ||
+                                def.node.init.type === 'Literal')) {
+                            return false;
+                        }
+                    }
+                    else {
+                        const pp = parent.parent;
+                        if (pp && pp.type === 'ExportNamedDeclaration' && pp.declaration === parent) {
+                            // Props
+                            return true;
+                        }
+                    }
+                    return hasWrite(variable);
+                }
+                return false;
+            });
+            cacheMutableVariable.set(variable, isMutableDefine);
+            return isMutableDefine;
+        }
+        /** Checks whether the given variable has a write or reactive store reference or not. */
+        function hasWrite(variable) {
+            const defIds = variable.defs.map((def) => def.name);
+            for (const reference of variable.references) {
+                if (reference.isWrite() &&
+                    !defIds.some((defId) => defId.range[0] <= reference.identifier.range[0] &&
+                        reference.identifier.range[1] <= defId.range[1])) {
+                    return true;
+                }
+                if (hasWriteMember(reference.identifier)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+        /** Checks whether the given expression has writing to a member or not. */
+        function hasWriteMember(expr) {
+            if (expr.type === 'JSXIdentifier')
+                return false;
+            const parent = expr.parent;
+            if (parent.type === 'AssignmentExpression') {
+                return parent.left === expr;
+            }
+            if (parent.type === 'UpdateExpression') {
+                return parent.argument === expr;
+            }
+            if (parent.type === 'UnaryExpression') {
+                return parent.operator === 'delete' && parent.argument === expr;
+            }
+            if (parent.type === 'MemberExpression') {
+                return parent.object === expr && hasWriteMember(parent);
+            }
+            if (parent.type === 'SvelteDirective') {
+                return parent.kind === 'Binding' && parent.expression === expr;
+            }
+            if (parent.type === 'SvelteEachBlock') {
+                return parent.expression === expr && hasWriteReference(parent.context);
+            }
+            return false;
+        }
+        /** Checks whether the given pattern has writing or not. */
+        function hasWriteReference(pattern) {
+            for (const id of (0, ast_utils_1.iterateIdentifiers)(pattern)) {
+                const variable = (0, ast_utils_1.findVariable)(context, id);
+                if (variable && hasWrite(variable))
+                    return true;
+            }
+            return false;
+        }
+        /**
+         * Iterates through references to top-level variables in the given range.
+         */
+        function* iterateRangeReferences(scope, range) {
+            for (const variable of scope.variables) {
+                for (const reference of variable.references) {
+                    if (range[0] <= reference.identifier.range[0] &&
+                        reference.identifier.range[1] <= range[1]) {
+                        yield reference;
+                    }
+                }
+            }
+        }
+        return {
+            SvelteReactiveStatement(node) {
+                for (const reference of iterateRangeReferences(toplevelScope, node.range)) {
+                    if (reference.isWriteOnly()) {
+                        continue;
+                    }
+                    if (isMutableVariableReference(reference)) {
+                        return;
+                    }
+                }
+                for (const through of toplevelScope.through.filter((reference) => node.range[0] <= reference.identifier.range[0] &&
+                    reference.identifier.range[1] <= node.range[1])) {
+                    if (through.identifier.name.startsWith('$$')) {
+                        // Builtin `$$` vars
+                        return;
+                    }
+                    if (through.resolved == null) {
+                        // Do not report if there are missing references.
+                        return;
+                    }
+                }
+                context.report({
+                    node: node.body.type === 'ExpressionStatement' &&
+                        node.body.expression.type === 'AssignmentExpression' &&
+                        node.body.expression.operator === '='
+                        ? node.body.expression.right
+                        : node.body,
+                    messageId: 'immutable'
+                });
+            }
+        };
+    }
+});