Refactor oversized agentd modules.
Problem:
Omni/Agentd.hs and Omni/Agentd/Daemon.hs are both very large, increasing maintenance risk and merge conflicts.
Scope:
- Split by concern (CLI parsing/commands, persistent lifecycle, logs/watch, top UI, shared parsing/utils).
- Keep behavior unchanged.
Acceptance:
- Main modules are substantially smaller and delegate to focused submodules.
- Existing tests pass unchanged.
Split oversized agentd modules by concern. Extracted persistent watch/activity event parsing + rendering from Omni/Agentd.hs into Omni/Agentd/PersistentView.hs, and extracted shared session JSON parsing and log filtering from Omni/Agentd/Daemon.hs into Omni/Agentd/SessionJson.hs and Omni/Agentd/LogFilter.hs. Kept Daemon/CLI APIs stable by re-exporting/bridging existing LogFilterOptions/defaultLogFilterOptions/streamAgentLogs behavior through the new modules. Line counts now: Omni/Agentd.hs 3771 -> 3442, Omni/Agentd/Daemon.hs 2917 (post-t804 baseline) -> 2775. Verified with typecheck.sh on all touched modules, lint on touched modules, bild --test Omni/Agentd/Daemon.hs, and bild --test Omni/Agentd.hs. Commit: 20a2dd4d