fix(windows): start and persist host agent after install

[Lightheartdevs]

Summary

• The Windows installer never ported the host agent startup from Linux Phase 07
• After install, the dashboard showed "Host agent is offline" and extension management was completely broken
• This adds agent startup during install, login persistence via Windows Scheduled Task, and full CLI management (.\dream.ps1 agent start/stop/restart/status/logs)

Changes

installers/windows/lib/constants.ps1

• Add agent constants (port 7710, PID file, log file, health URL, scheduled task name)

installers/windows/phases/07-devtools.ps1

• Start host agent after devtools installation (with reinstall handling — kills old agent first)
• Register DreamServerHostAgent Windows Scheduled Task for login persistence
• Prepend Docker bin to PATH so agent can find docker.exe on fresh installs
• Graceful fallback if Python is missing

installers/windows/dream.ps1

• Add Invoke-Agent function with status|start|stop|restart|logs subcommands (mirrors Linux cmd_agent())
• Wire agent command into dispatch switch
• Integrate agent health into Invoke-Status output
• Auto-start agent on dream.ps1 start (all services)
• Auto-stop agent on dream.ps1 stop (all services)
• Add to help text

Test plan

• .\dream.ps1 agent status — reports running/not responding
• .\dream.ps1 agent start — starts agent, health check passes
• .\dream.ps1 agent stop — stops agent, cleans PID file
• .\dream.ps1 agent restart — stop + start cycle
• .\dream.ps1 status — shows Host Agent line in status output
• Dashboard extensions page — "Host agent is offline" banner gone
• .\dream.ps1 agent logs — tails log file
• Scheduled task persists across reboot
• Reinstall kills old agent and starts fresh

Note

The Windows python3.exe App Execution Alias (Microsoft Store redirect) can crash the agent if it spawns python3 internally. Users who encounter this should disable the alias in Settings → Apps → Advanced app settings → App execution aliases. This is a pre-existing agent issue, not introduced by this PR.

🤖 Generated with Claude Code

[github-actions]

Sensitive Files Detected

Trigger: Security-sensitive files detected: dream-server/installers/

Files flagged:

dream-server/installers/windows/dream.ps1
dream-server/installers/windows/lib/constants.ps1
dream-server/installers/windows/phases/07-devtools.ps1

Extra human review is recommended for this PR.

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Claude Code Review | Sensitive File Detection | ~$1.50