logs: consolidate all logging under ~/.consciousness/logs/

All log output was scattered across ~/.consciousness/memory/ (daemon,
task logs, LLM call logs), ~/.consciousness/agent-sessions/ (observe),
and only hook logs were already in the right place.

Move everything to ~/.consciousness/logs/ with agent-specific subdirs:
  - daemon.log, daemon/ (task logs)
  - {agent_name}/ (knowledge agent logs, e.g. surface-observe/, reflect/)
  - llm/{caller}/ (LLM call logs)
  - observe.log (poc-agent observe)
  - hook-{session_id} (already correct)
  - debug.log (already correct)

Also includes the session.rs and hook.rs fixes from the previous
session (sessions dir → ~/.consciousness/sessions/).

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/tui.rs

@@ -34,7 +34,7 @@ const AGENT_TYPES: &[&str] = &[
 ];
 
 fn log_path() -> PathBuf {
-    crate::config::get().data_dir.join("daemon.log")
+    dirs::home_dir().unwrap_or_default().join(".consciousness/logs/daemon.log")
 }
 
 // --- Data fetching ---