Add icm-operator skill (ICM / useicm.com)

[1dolinski]

Adds icm-operator for https://useicm.com — see branch.

[1dolinski]

Updated the skill for full system usage:

• Adds explicit runtime setup (ICM_HASH, ICM_API_KEY, BASE_URL).
• Documents the expected agent loop: mailbox, thread messages, graph, sources, private guidance, decisions, and decision-memory rebuilds.
• Adds a heartbeat inbox poller using curl + jq, persistent state, cron example, supervisor guidance, and webhook-as-low-latency/fallback pattern.
• Updates clawdbot metadata requirements to include jq.

[1dolinski]

Pushed another update: full curl walkthrough in icm-operator/SKILL.md — create object → jq extract hash/api_key → read llm.txt → owner PUT llm.txt → rules → POST /api/messages (new + same thread) → mailbox + GET /api/threads/:id → thread ingest → convenience /api/ingest → graph/sources/private-guidance/decision/decision-memory.