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/cross-spawn/lib/util/escape.js

@@ -0,0 +1,47 @@
+'use strict';
+
+// See http://www.robvanderwoude.com/escapechars.php
+const metaCharsRegExp = /([()\][%!^"`<>&|;, *?])/g;
+
+function escapeCommand(arg) {
+    // Escape meta chars
+    arg = arg.replace(metaCharsRegExp, '^$1');
+
+    return arg;
+}
+
+function escapeArgument(arg, doubleEscapeMetaChars) {
+    // Convert to string
+    arg = `${arg}`;
+
+    // Algorithm below is based on https://qntm.org/cmd
+    // It's slightly altered to disable JS backtracking to avoid hanging on specially crafted input
+    // Please see https://github.com/moxystudio/node-cross-spawn/pull/160 for more information
+
+    // Sequence of backslashes followed by a double quote:
+    // double up all the backslashes and escape the double quote
+    arg = arg.replace(/(?=(\\+?)?)\1"/g, '$1$1\\"');
+
+    // Sequence of backslashes followed by the end of the string
+    // (which will become a double quote later):
+    // double up all the backslashes
+    arg = arg.replace(/(?=(\\+?)?)\1$/, '$1$1');
+
+    // All other backslashes occur literally
+
+    // Quote the whole thing:
+    arg = `"${arg}"`;
+
+    // Escape meta chars
+    arg = arg.replace(metaCharsRegExp, '^$1');
+
+    // Double escape meta chars if necessary
+    if (doubleEscapeMetaChars) {
+        arg = arg.replace(metaCharsRegExp, '^$1');
+    }
+
+    return arg;
+}
+
+module.exports.command = escapeCommand;
+module.exports.argument = escapeArgument;

web/node_modules/cross-spawn/lib/util/readShebang.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const fs = require('fs');
+const shebangCommand = require('shebang-command');
+
+function readShebang(command) {
+    // Read the first 150 bytes from the file
+    const size = 150;
+    const buffer = Buffer.alloc(size);
+
+    let fd;
+
+    try {
+        fd = fs.openSync(command, 'r');
+        fs.readSync(fd, buffer, 0, size, 0);
+        fs.closeSync(fd);
+    } catch (e) { /* Empty */ }
+
+    // Attempt to extract shebang (null is returned if not a shebang)
+    return shebangCommand(buffer.toString());
+}
+
+module.exports = readShebang;

web/node_modules/cross-spawn/lib/util/resolveCommand.js

@@ -0,0 +1,52 @@
+'use strict';
+
+const path = require('path');
+const which = require('which');
+const getPathKey = require('path-key');
+
+function resolveCommandAttempt(parsed, withoutPathExt) {
+    const env = parsed.options.env || process.env;
+    const cwd = process.cwd();
+    const hasCustomCwd = parsed.options.cwd != null;
+    // Worker threads do not have process.chdir()
+    const shouldSwitchCwd = hasCustomCwd && process.chdir !== undefined && !process.chdir.disabled;
+
+    // If a custom `cwd` was specified, we need to change the process cwd
+    // because `which` will do stat calls but does not support a custom cwd
+    if (shouldSwitchCwd) {
+        try {
+            process.chdir(parsed.options.cwd);
+        } catch (err) {
+            /* Empty */
+        }
+    }
+
+    let resolved;
+
+    try {
+        resolved = which.sync(parsed.command, {
+            path: env[getPathKey({ env })],
+            pathExt: withoutPathExt ? path.delimiter : undefined,
+        });
+    } catch (e) {
+        /* Empty */
+    } finally {
+        if (shouldSwitchCwd) {
+            process.chdir(cwd);
+        }
+    }
+
+    // If we successfully resolved, ensure that an absolute path is returned
+    // Note that when a custom `cwd` was used, we need to resolve to an absolute path based on it
+    if (resolved) {
+        resolved = path.resolve(hasCustomCwd ? parsed.options.cwd : '', resolved);
+    }
+
+    return resolved;
+}
+
+function resolveCommand(parsed) {
+    return resolveCommandAttempt(parsed) || resolveCommandAttempt(parsed, true);
+}
+
+module.exports = resolveCommand;