feat(bot): hardening + auto-responder, query commands, quiet hours

Reply-bot overhaul on top of the trigger/reply auto-reply:

Robustness
- single botTriggerMatches() shared by DM/channel paths; named constants
  (BOT_REPLY_COOLDOWN_MS / BOT_SCRATCH) replace magic numbers.
- per-contact DM throttle (8-entry ring) so a second sender isn't starved
  while one contact is on cooldown.
- channel anti-loop: skip only when an incoming message equals our own reply
  (was: any reply containing the trigger word — which silently killed channel
  replies for the common "trigger word in reply" setup).

Features
- away / reply-to-all: a lone "*" trigger matches every message.
- independent DM vs channel triggers (bot_trigger / bot_trigger_ch); "*" works
  on the channel too, bounded by cooldown + echo guard.
- query commands: a DM or monitored-channel message is scanned for "!word"
  tokens — !ping/!batt/!loc/!time/!temp/!hops/!status/!help — merged into one
  combined reply. DM = per-contact throttle, ignores quiet hours; channel =
  broadcast, per-channel cooldown, respects quiet hours. !hops uses
  getPathHashCount() (0 = direct).
- quiet hours (bot_quiet_start/end, local, wraps midnight) silence push replies.
- reply counter shown in the BotScreen header.

UI / storage
- BotScreen: 9 rows, scrolling list (no more cramming), field I/O via
  fieldBuf()/fieldCap().
- prefs bot_commands_enabled / bot_quiet_start / bot_quiet_end / bot_trigger_ch
  persisted; schema 0xC0DE000A → 0xC0DE000C with clamping + migration
  (bot_trigger_ch seeded from bot_trigger on upgrade).
- docs: tools_screen bot section rewritten; FEATURES.md refreshed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

examples/companion_radio/MyMesh.cpp

@@ -569,7 +569,13 @@ void MyMesh::onMessageRecv(const ContactInfo &from, mesh::Packet *pkt, uint32_t
   markConnectionActive(from); // in case this is from a server, and we have a connection
   queueMessage(from, TXT_TYPE_PLAIN, pkt, sender_timestamp, NULL, 0, text);
 
-  tryBotReplyDM(from, text);
+  // hop count of the received message. getPathHashCount() (low 6 bits of path_len)
+  // is the number of repeaters traversed — the same value the mesh uses for flood
+  // retransmit priority. 0 = heard directly. (Raw path_len is a size/count
+  // bitfield for transport packets, so it must not be used directly.)
+  uint8_t hops = pkt ? pkt->getPathHashCount() : 0;
+  if (!tryBotCommand(from, text, hops))  // commands take priority; fall through to trigger reply
+    tryBotReplyDM(from, text);
 }
 
 void MyMesh::onCommandDataRecv(const ContactInfo &from, mesh::Packet *pkt, uint32_t sender_timestamp,
@@ -639,7 +645,9 @@ void MyMesh::onChannelMessageRecv(const mesh::GroupChannel &channel, mesh::Packe
   if (_ui) _ui->newMsg(path_len, channel_name, text, offline_queue_len, 0);
 #endif
 
-  tryBotReplyChannel(channel_idx, text);
+  // hop count for !hops (see onMessageRecv); not the wire path_len above.
+  if (!tryBotChannelCommand(channel_idx, text, pkt->getPathHashCount()))  // commands take priority
+    tryBotReplyChannel(channel_idx, text);
 }
 
 void MyMesh::onChannelDataRecv(const mesh::GroupChannel &channel, mesh::Packet *pkt, uint16_t data_type,
@@ -1217,8 +1225,9 @@ MyMesh::MyMesh(mesh::Radio &radio, mesh::RNG &rng, mesh::RTCClock &rtc, SimpleMe
   _last_relay_seq = 0;
   offline_queue_len = 0;
   app_target_ver = 0;
-  _bot_last_dm_reply_ms = 0;
   _bot_last_ch_reply_ms = 0;
+  memset(_bot_dm_log, 0, sizeof(_bot_dm_log));
+  _bot_reply_count = 0;
   _next_auto_advert_ms = 0;
   clearPendingReqs();
   next_ack_idx = 0;
@@ -1262,6 +1271,10 @@ MyMesh::MyMesh(mesh::Radio &radio, mesh::RNG &rng, mesh::RTCClock &rtc, SimpleMe
   _prefs.bot_trigger[0] = '\0';
   _prefs.bot_reply_dm[0] = '\0';
   _prefs.bot_reply_ch[0] = '\0';
+  _prefs.bot_trigger_ch[0] = '\0';
+  _prefs.bot_commands_enabled = 0;
+  _prefs.bot_quiet_start = 0;
+  _prefs.bot_quiet_end = 0;       // start==end → quiet hours disabled
   _prefs.dm_show_all = 1;        // show all contacts by default
   _prefs.dm_resend_count = 2;    // auto-resend on-device DMs twice by default
   memset(_prefs.dm_notif, 0, sizeof(_prefs.dm_notif));