feat: custom roles, Tailwind settings pages, pg.css fixes, doc cleanup

Model Registry:
- Add per-user custom roles (add/remove via UI); required roles chat/orchestrator/distill
  are always present and cannot be removed
- Auto-migrate legacy .env-defined roles to custom_roles on first access
- Role config panel (gear): Remove role button moved inside panel; required badge below name
- Role select: Primary + Backup slots only (was three)

Settings pages — Tailwind CSS migration (CDN, preflight: false):
- local_llm.html, settings.html, help.html, notifications.html, tools_settings.html,
  crons.html, integrations.html all migrated; pg-* color tokens; dark/light via data-theme

pg.css fixes:
- input[type=checkbox/radio]: width: auto — prevents pg.css width:100% from stretching checkboxes
- btn-submit: responsive sizing via Tailwind w-full md:w-96 on each button (no longer full-width on desktop)

Documentation:
- MASTER.md, TODO__Agents.md: remove "/ Inara" from titles; description updated to "per-user AI personas"
- HELP.md: persona-agnostic language throughout (NC Talk, Google Chat, push, schedules, HA sections);
  roles section restructured to show required vs. custom roles with examples
- notifications.html: subtitle and HA description use "your persona" not "Inara"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cortex/static/pg.css

@@ -91,6 +91,7 @@ input, select, textarea {
 input:focus, select:focus, textarea:focus { border-color: var(--pg-action); }
 input[readonly] { color: var(--pg-muted); cursor: default; }
 input[type="password"] { font-family: monospace; letter-spacing: 0.05em; }
+input[type="checkbox"], input[type="radio"] { width: auto; padding: 0; }
 
 textarea {
   font-family: 'SF Mono', 'Fira Mono', 'Menlo', monospace;
@@ -99,12 +100,12 @@ textarea {
 
 /* ── Buttons ── */
 
-/* Full-width primary form submit */
+/* Primary form submit */
 .btn-submit {
-  width: 100%; padding: 0.7rem; margin-top: 0.25rem;
+  padding: 0.6rem 1.5rem; margin-top: 0.25rem;
   background: var(--pg-action); border: none; border-radius: 6px;
-  color: #fff; font-size: 1rem; font-weight: 600;
-  cursor: pointer; transition: background 0.15s;
+  color: #fff; font-size: 0.9rem; font-weight: 600;
+  cursor: pointer; transition: opacity 0.15s;
 }
 .btn-submit:hover { opacity: 0.88; }