feat: Add Loki MCP server scaffold, fix adapter blocking, upgrade model

- Scaffold mcp_servers/loki/ with config and async HTTP client
- Fix Slack/Telegram adapters to use non-blocking connections
- Upgrade default model to claude-sonnet-4-6
- Improve Agent SDK message collection for empty ResultMessage cases
- Add Message-ID to email summaries, increase body truncation limit
- Fix .gitignore inline comments that broke sensitive file exclusions

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

.gitignore

@@ -42,18 +42,26 @@ Thumbs.db
 *.local.json
 .env
 .env.local
-scripts/proxmox_ssh.sh  # Contains Proxmox root password (legacy)
-scripts/proxmox_ssh.py  # Contains Proxmox root password (paramiko)
-config/scheduled_tasks.yaml  # Use scheduled_tasks.example.yaml instead
+# Contains Proxmox root password (legacy)
+scripts/proxmox_ssh.sh
+# Contains Proxmox root password (paramiko)
+scripts/proxmox_ssh.py
+# Use scheduled_tasks.example.yaml instead
+config/scheduled_tasks.yaml
 
-# Memory workspace (optional - remove if you want to version control)
+# Memory workspace — personal data, do NOT commit
 memory_workspace/memory/*.md
 memory_workspace/memory_index.db
-memory_workspace/users/*.md  # User profiles (jordan.md, etc.)
+# User profiles (jordan.md, etc.)
+memory_workspace/users/*.md
 memory_workspace/vectors.usearch
-memory_workspace/obsidian/  # Zettelkasten vault (personal notes)
-memory_workspace/SOUL.md  # Personal config (use SOUL.example.md)
-memory_workspace/MEMORY.md  # Personal memory (use MEMORY.example.md)
+# Zettelkasten vault (personal notes, API keys, credentials)
+memory_workspace/obsidian/
+# Personal config (use SOUL.example.md)
+memory_workspace/SOUL.md
+# Personal memory
+memory_workspace/MEMORY.md
+memory_workspace/MEMORY.md.old
 
 # User profiles (personal info)
 users/