fix: stop dimming setup card bodies

Clack's `p.note` defaults to `format: e => styleText("dim", e)`, which
fades note bodies regardless of the project's stated readability stance
(see comment on `dimWrap` in setup/lib/theme.ts: "prose renders at the
terminal's regular weight"). The dim styling makes body copy hard to
read on dark terminals and visibly washes out brand-colored segments
embedded in cards (e.g. the chip + bold heading rows).

Add a `note()` helper in setup/lib/theme.ts that wraps `p.note` with a
pass-through formatter, and route every setup-flow `p.note` call site
through it: setup/auto.ts, every setup/channels/*.ts adapter, and the
two setup/lib/claude-* helpers.

Pre-styled segments (brandBold, brandChip, formatPairingCard,
formatCodeCard) now render at full strength instead of being faded
alongside surrounding prose.

setup/channels/signal.ts

@@ -44,6 +44,7 @@ import {
   writeStepEntry,
 } from '../lib/runner.js';
 import { askOperatorRole } from '../lib/role-prompt.js';
+import { note } from '../lib/theme.js';
 
 const DEFAULT_AGENT_NAME = 'Nano';
 
@@ -139,7 +140,7 @@ async function ensureSignalCli(): Promise<void> {
   if (!probe.error && probe.status === 0) return;
 
   if (process.platform === 'darwin') {
-    p.note(
+    note(
       [
         "NanoClaw talks to Signal through signal-cli, which isn't installed yet.",
         '',
@@ -152,7 +153,7 @@ async function ensureSignalCli(): Promise<void> {
       'signal-cli not found',
     );
   } else {
-    p.note(
+    note(
       [
         "NanoClaw talks to Signal through signal-cli, which isn't installed yet.",
         '',