feat(setup): advanced settings registry with remote OneCLI support

Adds a single config registry that drives both CLI flags and an opt-in
advanced-settings screen, so power users can override defaults like
remote OneCLI host/token or alt Anthropic endpoints without burdening
the standard linear flow with extra prompts.

Why: advanced configurations didn't fit cleanly into the existing
sequenced setup. PR #2030 took the "add another prompt step" route for
remote OneCLI; this approach instead routes those overrides through a
single source of truth so adding the next knob (alt endpoint, custom
host pattern, …) doesn't mean another prompt-or-skip decision.

setup/lib/setup-config.ts — schema (typed entry list with surface
'flag' | 'flag+ui'), name derivation (camelCase → NANOCLAW_UPPER_SNAKE
+ --kebab-case), seeded with --onecli-api-host, --onecli-api-token,
--anthropic-base-url, plus existing NANOCLAW_SKIP / NANOCLAW_DISPLAY_NAME
as flag-only entries.

setup/lib/setup-config-parse.ts — argv parser (--key value, --key=value,
--no-bool, -- terminator), env reader, applyToEnv() bridge that writes
resolved values back to process.env so existing step code keeps reading
env vars unchanged. Also --help printer.

setup/lib/setup-config-screen.ts — interactive menu loop. Entries
render with current value as hint; selecting one opens the right prompt
type (text / password for secrets / confirm / brightSelect for enums);
"Done" returns to the main flow.

setup/auto.ts — parses argv first (--help short-circuits before any
render), folds env+flags into process.env, then offers a welcome menu:
"Standard setup" (default) vs "Advanced". The onecli step branches on
NANOCLAW_ONECLI_API_HOST: if set, skips the local-vs-fresh prompt
entirely, runs pollHealth pre-flight, then calls runQuietStep with
--remote-url. Token, when provided, writes through to ONECLI_API_KEY in
.env. Welcome copy tightened (drops the duplicate wordmark/tagline) so
the bash → clack handoff reads as one flow.

setup/onecli.ts — cherries the --remote-url implementation from PR
run()) and generalizes writeEnvOnecliUrl into a writeEnvVar helper so
ONECLI_API_KEY follows the same upsert path.

nanoclaw.sh — forwards "$@" to setup:auto so flags reach the parser;
trims the redundant "Setting up your personal AI assistant" subtitle
and the bootstrap teach line so the pre-clack section isn't competing
with the clack intro for the same role.

Token plumbing only fires in --remote-url mode; local installs are
unauthenticated against localhost and don't need it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

setup/onecli.ts

@@ -86,17 +86,22 @@ function ensureShellProfilePath(): void {
   }
 }
 
-function writeEnvOnecliUrl(url: string): void {
+function writeEnvVar(name: string, value: string): void {
   const envFile = path.join(process.cwd(), '.env');
   let content = fs.existsSync(envFile) ? fs.readFileSync(envFile, 'utf-8') : '';
-  if (/^ONECLI_URL=/m.test(content)) {
-    content = content.replace(/^ONECLI_URL=.*$/m, `ONECLI_URL=${url}`);
+  const re = new RegExp(`^${name}=.*$`, 'm');
+  if (re.test(content)) {
+    content = content.replace(re, `${name}=${value}`);
   } else {
-    content = content.trimEnd() + (content ? '\n' : '') + `ONECLI_URL=${url}\n`;
+    content = content.trimEnd() + (content ? '\n' : '') + `${name}=${value}\n`;
   }
   fs.writeFileSync(envFile, content);
 }
 
+function writeEnvOnecliUrl(url: string): void {
+  writeEnvVar('ONECLI_URL', url);
+}
+
 // Last-known-good CLI release. Used only if BOTH the upstream installer
 // and the redirect-based version probe fail. Bump deliberately when a
 // new CLI release ships.
@@ -257,6 +262,8 @@ export async function run(args: string[]): Promise<void> {
   ensureShellProfilePath();
 
   if (remoteUrl) {
+    // Remote-mode: install only the CLI, point it at the remote gateway, and
+    // record the URL in .env. No local gateway is started.
     log.info('Installing OneCLI CLI for remote gateway', { remoteUrl });
     const res = installOnecliCliOnly();
     if (!res.ok || !onecliVersion()) {
@@ -279,6 +286,11 @@ export async function run(args: string[]): Promise<void> {
     }
     writeEnvOnecliUrl(remoteUrl);
     log.info('Wrote ONECLI_URL to .env', { url: remoteUrl });
+    const remoteToken = process.env.NANOCLAW_ONECLI_API_TOKEN?.trim();
+    if (remoteToken) {
+      writeEnvVar('ONECLI_API_KEY', remoteToken);
+      log.info('Wrote ONECLI_API_KEY to .env');
+    }
     const healthy = await pollHealth(remoteUrl, 5000);
     emitStatus('ONECLI', {
       INSTALLED: true,