fix(bluebubbles): add missing integration points and documentation (#6460)

- hermes_cli/skills_config.py: add platform label for per-platform skill config
- gateway/session.py: add to PII-safe platforms (no mention system)
- website/docs/user-guide/messaging/bluebubbles.md: full setup guide
- website/sidebars.ts: sidebar navigation entry
- 10 docs pages: add BlueBubbles to all platform enumerations
  (env vars, toolsets, cron delivery, gateway internals, etc.)

website/docs/developer-guide/architecture.md

@@ -116,9 +116,9 @@ hermes-agent/
 │   ├── mirror.py             # Cross-session message mirroring
 │   ├── status.py             # Token locks, profile-scoped process tracking
 │   ├── builtin_hooks/        # Always-registered hooks
-│   └── platforms/            # 14 adapters: telegram, discord, slack, whatsapp,
+│   └── platforms/            # 15 adapters: telegram, discord, slack, whatsapp,
 │                             #   signal, matrix, mattermost, email, sms,
-│                             #   dingtalk, feishu, wecom, homeassistant, webhook
+│                             #   dingtalk, feishu, wecom, bluebubbles, homeassistant, webhook
 │
 ├── acp_adapter/              # ACP server (VS Code / Zed / JetBrains)
 ├── cron/                     # Scheduler (jobs.py, scheduler.py)

website/docs/developer-guide/cron-internals.md

@@ -153,6 +153,7 @@ Cron job results can be delivered to any supported platform:
 | DingTalk | `dingtalk` | Deliver to DingTalk |
 | Feishu | `feishu` | Deliver to Feishu |
 | WeCom | `wecom` | Deliver to WeCom |
+| BlueBubbles | `bluebubbles` | Deliver to iMessage via BlueBubbles |
 
 For Telegram topics, use the format `telegram:<chat_id>:<thread_id>` (e.g., `telegram:-1001234567890:17585`).
 

website/docs/developer-guide/gateway-internals.md

@@ -160,6 +160,7 @@ gateway/platforms/
 ├── dingtalk.py          # DingTalk WebSocket
 ├── feishu.py            # Feishu/Lark WebSocket or webhook
 ├── wecom.py             # WeCom (WeChat Work) callback
+├── bluebubbles.py       # Apple iMessage via BlueBubbles macOS server
 ├── webhook.py           # Inbound/outbound webhook adapter
 ├── api_server.py        # REST API server adapter
 └── homeassistant.py     # Home Assistant conversation integration