Add messaging platform enhancements: STT, stickers, Discord UX, Slack, pairing, hooks

Major feature additions inspired by OpenClaw/ClawdBot integration analysis:

Voice Message Transcription (STT):
- Auto-transcribe voice/audio messages via OpenAI Whisper API
- Download voice to ~/.hermes/audio_cache/ on Telegram/Discord/WhatsApp
- Inject transcript as text so all models can understand voice input
- Configurable model (whisper-1, gpt-4o-mini-transcribe, gpt-4o-transcribe)

Telegram Sticker Understanding:
- Describe static stickers via vision tool with JSON-backed cache
- Cache keyed by file_unique_id avoids redundant API calls
- Animated/video stickers get emoji-based fallback description

Discord Rich UX:
- Native slash commands (/ask, /reset, /status, /stop) via app_commands
- Button-based exec approvals (Allow Once / Always Allow / Deny)
- ExecApprovalView with user authorization and timeout handling

Slack Integration:
- Full SlackAdapter using slack-bolt with Socket Mode
- DMs, channel messages (mention-gated), /hermes slash command
- File attachment handling with bot-token-authenticated downloads

DM Pairing System:
- Code-based user authorization as alternative to static allowlists
- 8-char codes from unambiguous alphabet, 1-hour expiry
- Rate limiting, lockout after failed attempts, chmod 0600 on data
- CLI: hermes pairing list/approve/revoke/clear-pending

Event Hook System:
- File-based hook discovery from ~/.hermes/hooks/
- HOOK.yaml + handler.py per hook, sync/async handler support
- Events: gateway:startup, session:start/reset, agent:start/step/end
- Wildcard matching (command:* catches all command events)

Cross-Channel Messaging:
- send_message agent tool for delivering to any connected platform
- Enables cron job delivery and cross-platform notifications

Human-Like Response Pacing:
- Configurable delays between message chunks (off/natural/custom)
- HERMES_HUMAN_DELAY_MODE env var with min/max ms settings

Warm Injection Message Style:
- Retrofitted image vision messages with friendly kawaii-consistent tone
- All new injection messages (STT, stickers, errors) use warm style

Also: updated config migration to prompt for optional keys interactively,
bumped config version, updated README, AGENTS.md, .env.example,
cli-config.yaml.example, install scripts, pyproject.toml, and toolsets.

toolsets.py

@@ -184,7 +184,9 @@ TOOLSETS = {
             # Skills - access knowledge base
             "skills_list", "skill_view",
             # Cronjob management - let users schedule tasks
-            "schedule_cronjob", "list_cronjobs", "remove_cronjob"
+            "schedule_cronjob", "list_cronjobs", "remove_cronjob",
+            # Cross-channel messaging
+            "send_message"
         ],
         "includes": []
     },
@@ -207,7 +209,9 @@ TOOLSETS = {
             # Skills - access knowledge base
             "skills_list", "skill_view",
             # Cronjob management - let users schedule tasks
-            "schedule_cronjob", "list_cronjobs", "remove_cronjob"
+            "schedule_cronjob", "list_cronjobs", "remove_cronjob",
+            # Cross-channel messaging
+            "send_message"
         ],
         "includes": []
     },
@@ -230,7 +234,34 @@ TOOLSETS = {
             # Skills
             "skills_list", "skill_view",
             # Cronjob management
-            "schedule_cronjob", "list_cronjobs", "remove_cronjob"
+            "schedule_cronjob", "list_cronjobs", "remove_cronjob",
+            # Cross-channel messaging
+            "send_message"
+        ],
+        "includes": []
+    },
+    
+    "hermes-slack": {
+        "description": "Slack bot toolset - full access for workspace use (terminal has safety checks)",
+        "tools": [
+            # Terminal - enabled with dangerous command approval system
+            "terminal",
+            # File manipulation
+            "read_file", "write_file", "patch", "search",
+            # Web tools
+            "web_search", "web_extract",
+            # Vision - analyze images sent by users
+            "vision_analyze",
+            # Image generation
+            "image_generate",
+            # Text-to-speech
+            "text_to_speech",
+            # Skills - access knowledge base
+            "skills_list", "skill_view",
+            # Cronjob management - let users schedule tasks
+            "schedule_cronjob", "list_cronjobs", "remove_cronjob",
+            # Cross-channel messaging
+            "send_message"
         ],
         "includes": []
     },
@@ -238,7 +269,7 @@ TOOLSETS = {
     "hermes-gateway": {
         "description": "Gateway toolset - union of all messaging platform tools",
         "tools": [],
-        "includes": ["hermes-telegram", "hermes-discord", "hermes-whatsapp"]
+        "includes": ["hermes-telegram", "hermes-discord", "hermes-whatsapp", "hermes-slack"]
     }
 }