Email ticketing fixes, comms polish, and .env cleanup

Inbound:
- Gmail poll query is:unread in:inbox (was category:primary, which matched
  nothing on a no-tabs Workspace inbox)

Outbound email:
- Closed/escalation auto-emails editable via TICKET_CLOSE_MESSAGE and new
  TICKET_ESCALATION_EMAIL_MESSAGE; drop the staff signature from closing emails
- Replies quote the customer's latest message (gmail_quote markup so clients
  collapse it), embed custom emoji inline via CID attachment, and strip Discord
  role mentions
- Tagline spacing fix in the company signature

Discord side:
- Suppress all mentions in log + transcript posts (no more pinging on close)
- Drop the staff-role ping from new-ticket and follow-up notifications
- Ticket channels inherit category permissions instead of setting per-channel
  overwrites (removes the Manage Roles requirement)

Gmail folders:
- Folder/label routing (gmailLabels.js) with /folder; close files to Complete

Config:
- Remove ~56 stale .env keys for long-removed features; refresh stale copy

Docs:
- Design specs for folder routing, email-flow toggle, and per-staff metrics

config.js

@@ -36,9 +36,11 @@ const CONFIG = {
   EMAIL_ESCALATED3_CHANNEL_ID: process.env.EMAIL_ESCALATED3_CHANNEL_ID || null,
   DISCORD_ESCALATED3_CHANNEL_ID: process.env.DISCORD_ESCALATED3_CHANNEL_ID || null,
   ESCALATION_MESSAGE: process.env.ESCALATION_MESSAGE || 'Your ticket has been escalated.\n\nA senior {support_name} will be here to assist as soon as possible.',
+  // Email tickets only (escalation notification email body). Placeholders: {escalator_name}, {tier}.
+  TICKET_ESCALATION_EMAIL_MESSAGE: process.env.TICKET_ESCALATION_EMAIL_MESSAGE || '{escalator_name} escalated this ticket to {tier}.',
   TICKET_CLOSE_SUBJECT_PREFIX: process.env.TICKET_CLOSE_SUBJECT_PREFIX || '[Resolved]',
   // Email tickets only (closure email body):
-  TICKET_CLOSE_MESSAGE: process.env.TICKET_CLOSE_MESSAGE || 'This ticket has been marked as resolved. If you would like to re-open this issue, please reply to this email.',
+  TICKET_CLOSE_MESSAGE: process.env.TICKET_CLOSE_MESSAGE || '{closer_name} has marked this ticket as resolved. If you would like to re-open this issue, please reply to this email.',
   TICKET_CLOSE_SIGNATURE: process.env.TICKET_CLOSE_SIGNATURE || 'Thank you for using Indifferent Broccoli.',
   // Discord ticket closure (in-channel and transcript):
   DISCORD_CLOSE_MESSAGE: process.env.DISCORD_CLOSE_MESSAGE || 'This ticket has been closed. A transcript has been saved. If you still need assistance, please open a new ticket.',
@@ -75,6 +77,16 @@ const CONFIG = {
   ADMIN_ID: process.env.ADMIN_ID || null,
   FORCE_CLOSE_TIMER: toInt(process.env.FORCE_CLOSE_TIMER_SECONDS, 60),
   GMAIL_POLL_INTERVAL_MS: toInt(process.env.GMAIL_POLL_INTERVAL_SECONDS, 30) * 1000,
+  // Inbound email flow master switch. Absent/anything-but-"false" => on, so
+  // existing deployments keep polling with no .env change. Toggle via /email.
+  GMAIL_POLL_ENABLED: process.env.GMAIL_POLL_ENABLED !== 'false',
+  // Gmail "folder" (label) names for ticket-lifecycle routing — see services/gmailLabels.js.
+  GMAIL_LABEL_TRIAGE: process.env.GMAIL_LABEL_TRIAGE || 'Triage',
+  GMAIL_LABEL_ESCALATED: process.env.GMAIL_LABEL_ESCALATED || 'Escalated',
+  GMAIL_LABEL_RESOLVED: process.env.GMAIL_LABEL_RESOLVED || 'Resolved',
+  GMAIL_LABEL_FOR_JAKE: process.env.GMAIL_LABEL_FOR_JAKE || 'For Jake',
+  GMAIL_LABEL_DASHBOARD_ERRORS: process.env.GMAIL_LABEL_DASHBOARD_ERRORS || 'Dashboard Errors',
+  GMAIL_LABEL_PARTNERSHIP_OFFERS: process.env.GMAIL_LABEL_PARTNERSHIP_OFFERS || 'Partnership Offers',
   STAFF_THREAD_ENABLED: process.env.STAFF_THREAD_ENABLED === 'true',
   STAFF_THREAD_NAME: process.env.STAFF_THREAD_NAME || 'Staff Discussion',
   STAFF_THREAD_AUTO_ADD_ROLE: process.env.STAFF_THREAD_AUTO_ADD_ROLE === 'true',