Matrix-launched opencode sessions not registered in daemon state

[c-h-]

Bug

Sessions launched via agentctl launch --matrix are tracked in ~/.agentctl/opencode-sessions/ (wrapper scripts, .json metadata, .exit files) but are never registered in state.json.

This means:

• agentctl list never shows them
• agentctl status <id> returns 'Session not found'
• No lifecycle fuse is created
• No webhook fires on completion
• The supervisor pipeline never triggers

Evidence

# Sessions exist on disk:
ls ~/.agentctl/opencode-sessions/682870d7*.{json,exit,sh}  # all present

# But not in state:
agentctl status 682870d7  # Session not found
jq '.sessions[] | select(.id | startswith("682870"))' ~/.agentctl/state.json  # empty

Impact

This breaks the entire completion callback pipeline. Matrix-launched sessions run to completion but no downstream automation fires (webhooks, OrgLoop supervisor routes, etc.).

Expected

Matrix-launched sessions should be registered in daemon state just like single agentctl launch sessions.