fix(demo): point make register at new agent module paths

[guillaume-hexamind]

Problem

After the agents were reorganized into org subpackages (clinic_org/, tech_org/, shared/), the make register target still referenced the old flat module paths (agent_server.agents.<name>_agent). Running make register (and therefore make demo) failed on the very first agent:

ModuleNotFoundError: No module named 'agent_server.agents.healthcare_agent'

Fix

Point each --agent / --tools spec at its new location:

agent	new path
healthcare	agents.clinic_org.healthcare.healthcare_agent
devops	agents.tech_org.devops.devops_agent
itsm	agents.tech_org.itsm.itsm_agent (+:TOOLS)
hr	agents.shared.hr.hr_agent (+:TOOLS)

Verification

• All four modules import cleanly with the new paths and expose :agent (and :TOOLS where used).
• Scanned the rest of the repo for stale flat references — none outside the reorganized subpackages.
• The runtime selector agent_server/select.py was already updated as part of the reorg and imports fine.

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