move data home from ~/.claude/memory to ~/.consciousness

The consciousness project should stand independently of Claude Code.
All data, logs, sessions, and agent state now live under
~/.consciousness/ instead of being scattered across ~/.claude/memory/,
/tmp/claude-memory-search/, ~/.config/poc-memory/, and ~/.cache/.

Layout:
  ~/.consciousness/
    *.capnp, *.bin, *.rkyv  — store files
    sessions/               — per-session state (seen sets, cookies)
    logs/                   — all logs (hook, agent, debug, dream)
    agents/                 — agent runtime state (pid files, output)
    notifications/          — notification state
    cache/                  — transient data

Things that stay in ~/.claude/:
  - projects/    (Claude Code transcripts)
  - hooks/       (Claude Code hook system)
  - telegram/    (shared integration)
  - irc/         (shared integration)
  - settings.json (Claude Code settings)

Debug log moves from /tmp/ to ~/.consciousness/logs/debug.log.
Session state moves from /tmp/claude-memory-search/ to sessions/.
Notifications move from ~/.claude/notifications/ to notifications/.

src/agent/journal.rs

@@ -152,7 +152,7 @@ pub fn entries_in_range(
 pub fn default_journal_path() -> std::path::PathBuf {
     dirs::home_dir()
         .unwrap_or_default()
-        .join(".claude/memory/journal.md")
+        .join(".consciousness/journal.md")
 }
 
 #[cfg(test)]