Rename agent/ to user/ and poc-agent binary to consciousness

Mechanical rename: src/agent/ -> src/user/, all crate::agent:: ->
crate::user:: references updated. Binary poc-agent renamed to
consciousness with CLI name and user-facing strings updated.

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

src/user/tui/thalamus_screen.rs

@@ -0,0 +1,58 @@
+// thalamus_screen.rs — F5: attention routing / daemon status
+//
+// Shows poc-daemon status: presence detection, idle timer,
+// notification routing, activity level.
+
+use ratatui::{
+    layout::Rect,
+    style::{Color, Style},
+    text::Line,
+    widgets::{Block, Borders, Paragraph, Wrap},
+    Frame,
+};
+
+use super::{App, SCREEN_LEGEND};
+
+fn fetch_daemon_status() -> Vec<String> {
+    std::process::Command::new("poc-daemon")
+        .arg("status")
+        .output()
+        .ok()
+        .and_then(|o| {
+            if o.status.success() {
+                String::from_utf8(o.stdout).ok()
+            } else {
+                None
+            }
+        })
+        .map(|s| s.lines().map(String::from).collect())
+        .unwrap_or_else(|| vec!["daemon not running".to_string()])
+}
+
+impl App {
+    pub(crate) fn draw_thalamus(&self, frame: &mut Frame, size: Rect) {
+        let status_lines = fetch_daemon_status();
+        let section = Style::default().fg(Color::Yellow);
+
+        let mut lines: Vec<Line> = Vec::new();
+        lines.push(Line::styled("── Thalamus ──", section));
+        lines.push(Line::raw(""));
+
+        for line in &status_lines {
+            lines.push(Line::raw(format!("  {}", line)));
+        }
+
+        let block = Block::default()
+            .title_top(Line::from(SCREEN_LEGEND).left_aligned())
+            .title_top(Line::from(" thalamus ").right_aligned())
+            .borders(Borders::ALL)
+            .border_style(Style::default().fg(Color::Cyan));
+
+        let para = Paragraph::new(lines)
+            .block(block)
+            .wrap(Wrap { trim: false })
+            .scroll((self.debug_scroll, 0));
+
+        frame.render_widget(para, size);
+    }
+}