Move thalamus subcrate into main crate

Move thalamus/ (poc-daemon) source files into src/thalamus/ as a
module of the main crate. The daemon entry point becomes a library
function thalamus::run() with a thin poc-daemon binary for backward
compatibility.

- Copy thalamus source into src/thalamus/, fix crate:: -> super::
- Copy daemon.capnp into schema/, add to build.rs
- Re-export daemon_capnp at crate root (capnp codegen requires it)
- Add thalamus dependencies (capnp-rpc, tokio-util, toml, rustls, etc.)
- Keep thalamus/ subcrate for comparison

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

src/thalamus/idle.rs

@@ -0,0 +1,641 @@
+// Idle timer module.
+//
+// Tracks user presence and Claude response times. When Claude has been
+// idle too long, sends a contextual prompt to the tmux pane. Handles
+// sleep mode, quiet mode, consolidation suppression, and dream nudges.
+//
+// Designed as the first "module" — future IRC/Telegram modules will
+// follow the same pattern: state + tick + handle_command.
+
+use super::{context, home, now, notify, tmux};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use tracing::info;
+
+// Defaults
+const DEFAULT_IDLE_TIMEOUT: f64 = 5.0 * 60.0;
+const DEFAULT_NOTIFY_TIMEOUT: f64 = 2.0 * 60.0;
+const DEFAULT_SESSION_ACTIVE_SECS: f64 = 15.0 * 60.0;
+const DREAM_INTERVAL_HOURS: u64 = 18;
+
+/// EWMA decay half-life in seconds (5 minutes).
+const EWMA_DECAY_HALF_LIFE: f64 = 5.0 * 60.0;
+
+/// Minimum seconds between autonomous nudges.
+const MIN_NUDGE_INTERVAL: f64 = 15.0;
+
+/// Boost half-life in seconds (60s). A 60s turn covers half the gap to
+/// target; a 15s turn covers ~16%; a 2s turn covers ~2%.
+const EWMA_BOOST_HALF_LIFE: f64 = 60.0;
+
+/// Steady-state target for active work. The EWMA converges toward this
+/// during sustained activity rather than toward 1.0.
+const EWMA_TARGET: f64 = 0.75;
+
+/// Persisted subset of daemon state — survives daemon restarts.
+/// Includes both epoch floats (for computation) and ISO timestamps
+/// (for human debugging via `cat daemon-state.json | jq`).
+#[derive(Serialize, Deserialize, Default)]
+struct Persisted {
+    last_user_msg: f64,
+    last_response: f64,
+    #[serde(default)]
+    sleep_until: Option<f64>,
+    #[serde(default)]
+    claude_pane: Option<String>,
+    #[serde(default)]
+    idle_timeout: f64,
+    #[serde(default)]
+    notify_timeout: f64,
+    #[serde(default)]
+    activity_ewma: f64,
+    #[serde(default)]
+    ewma_updated_at: f64,
+    #[serde(default)]
+    session_active_secs: f64,
+    #[serde(default)]
+    in_turn: bool,
+    #[serde(default)]
+    turn_start: f64,
+    #[serde(default)]
+    last_nudge: f64,
+    // Human-readable mirrors — written but not consumed on load
+    #[serde(default, skip_deserializing)]
+    last_user_msg_time: String,
+    #[serde(default, skip_deserializing)]
+    last_response_time: String,
+    #[serde(default, skip_deserializing)]
+    saved_at: String,
+    #[serde(default, skip_deserializing)]
+    fired: bool,
+    #[serde(default, skip_deserializing)]
+    uptime: f64,
+}
+
+fn state_path() -> std::path::PathBuf {
+    home().join(".consciousness/daemon-state.json")
+}
+
+/// Compute EWMA decay factor: 0.5^(elapsed / half_life).
+fn ewma_factor(elapsed: f64, half_life: f64) -> f64 {
+    (0.5_f64).powf(elapsed / half_life)
+}
+
+/// Format epoch seconds as a human-readable ISO-ish timestamp.
+fn epoch_to_iso(epoch: f64) -> String {
+    if epoch == 0.0 {
+        return String::new();
+    }
+    let secs = epoch as u64;
+    // Use date command — simple and correct for timezone
+    std::process::Command::new("date")
+        .args(["-d", &format!("@{secs}"), "+%Y-%m-%dT%H:%M:%S%z"])
+        .output()
+        .ok()
+        .and_then(|o| String::from_utf8(o.stdout).ok())
+        .map(|s| s.trim().to_string())
+        .unwrap_or_default()
+}
+
+#[derive(Serialize)]
+pub struct State {
+    pub last_user_msg: f64,
+    pub last_response: f64,
+    pub claude_pane: Option<String>,
+    pub sleep_until: Option<f64>, // None=awake, 0=indefinite, >0=timestamp
+    pub quiet_until: f64,
+    pub consolidating: bool,
+    pub dreaming: bool,
+    pub dream_start: f64,
+    pub fired: bool,
+    pub idle_timeout: f64,
+    pub notify_timeout: f64,
+    pub activity_ewma: f64,
+    pub ewma_updated_at: f64,
+    pub session_active_secs: f64,
+    pub in_turn: bool,
+    pub turn_start: f64,
+    pub last_nudge: f64,
+    #[serde(skip)]
+    pub running: bool,
+    #[serde(skip)]
+    pub start_time: f64,
+    #[serde(skip)]
+    pub notifications: notify::NotifyState,
+}
+
+impl State {
+    pub fn new() -> Self {
+        Self {
+            last_user_msg: 0.0,
+            last_response: 0.0,
+            claude_pane: None,
+            sleep_until: None,
+            quiet_until: 0.0,
+            consolidating: false,
+            dreaming: false,
+            dream_start: 0.0,
+            fired: false,
+            idle_timeout: DEFAULT_IDLE_TIMEOUT,
+            notify_timeout: DEFAULT_NOTIFY_TIMEOUT,
+            session_active_secs: DEFAULT_SESSION_ACTIVE_SECS,
+            activity_ewma: 0.0,
+            ewma_updated_at: now(),
+            in_turn: false,
+            turn_start: 0.0,
+            last_nudge: 0.0,
+            running: true,
+            start_time: now(),
+            notifications: notify::NotifyState::new(),
+        }
+    }
+
+    pub fn load(&mut self) {
+        if let Ok(data) = fs::read_to_string(state_path()) {
+            if let Ok(p) = serde_json::from_str::<Persisted>(&data) {
+                self.sleep_until = p.sleep_until;
+                self.claude_pane = p.claude_pane;
+                if p.idle_timeout > 0.0 {
+                    self.idle_timeout = p.idle_timeout;
+                }
+                if p.notify_timeout > 0.0 {
+                    self.notify_timeout = p.notify_timeout;
+                }
+                if p.session_active_secs > 0.0 {
+                    self.session_active_secs = p.session_active_secs;
+                }
+                // Reset activity timestamps to now — timers count from
+                // restart, not from stale pre-restart state
+                let t = now();
+                self.last_user_msg = t;
+                self.last_response = t;
+                // Restore EWMA state, applying decay for time spent shut down
+                if p.ewma_updated_at > 0.0 {
+                    let elapsed = t - p.ewma_updated_at;
+                    self.activity_ewma = p.activity_ewma * ewma_factor(elapsed, EWMA_DECAY_HALF_LIFE);
+                    self.in_turn = p.in_turn;
+                    self.turn_start = p.turn_start;
+                    self.last_nudge = p.last_nudge;
+                }
+                self.ewma_updated_at = t;
+            }
+        }
+
+        // Always try to find the active pane
+        if self.claude_pane.is_none() {
+            self.claude_pane = tmux::find_claude_pane();
+        }
+
+        info!(
+            "loaded: user={:.0} resp={:.0} pane={:?} sleep={:?}",
+            self.last_user_msg, self.last_response, self.claude_pane, self.sleep_until,
+        );
+    }
+
+    pub fn save(&self) {
+        let p = Persisted {
+            last_user_msg: self.last_user_msg,
+            last_response: self.last_response,
+            sleep_until: self.sleep_until,
+            claude_pane: self.claude_pane.clone(),
+            last_user_msg_time: epoch_to_iso(self.last_user_msg),
+            last_response_time: epoch_to_iso(self.last_response),
+            saved_at: epoch_to_iso(now()),
+            fired: self.fired,
+            idle_timeout: self.idle_timeout,
+            notify_timeout: self.notify_timeout,
+            session_active_secs: self.session_active_secs,
+            activity_ewma: self.activity_ewma,
+            ewma_updated_at: self.ewma_updated_at,
+            in_turn: self.in_turn,
+            turn_start: self.turn_start,
+            last_nudge: self.last_nudge,
+            uptime: now() - self.start_time,
+        };
+        if let Ok(json) = serde_json::to_string_pretty(&p) {
+            let _ = fs::write(state_path(), json);
+        }
+    }
+
+    /// Decay the activity EWMA toward zero based on elapsed time.
+    fn decay_ewma(&mut self) {
+        let t = now();
+        let elapsed = t - self.ewma_updated_at;
+        if elapsed <= 0.0 {
+            return;
+        }
+        self.activity_ewma *= ewma_factor(elapsed, EWMA_DECAY_HALF_LIFE);
+        self.ewma_updated_at = t;
+    }
+
+    /// Boost the EWMA based on turn duration. The boost is proportional to
+    /// distance from EWMA_TARGET, scaled by a saturation curve on duration.
+    /// A 15s turn covers half the gap to target; a 2s turn barely registers.
+    /// Self-limiting: converges toward target, can't overshoot.
+    fn boost_ewma(&mut self, turn_duration: f64) {
+        let gap = (EWMA_TARGET - self.activity_ewma).max(0.0);
+        let saturation = 1.0 - ewma_factor(turn_duration, EWMA_BOOST_HALF_LIFE);
+        self.activity_ewma += gap * saturation;
+    }
+
+    // Typed handlers for RPC
+    pub fn handle_user(&mut self, pane: &str) {
+        self.decay_ewma();
+        self.in_turn = true;
+        self.turn_start = now();
+        let from_user = !self.fired;
+        if from_user {
+            self.last_user_msg = now();
+            self.notifications.set_activity(notify::Activity::Focused);
+        }
+        self.fired = false;
+        if !pane.is_empty() {
+            self.claude_pane = Some(pane.to_string());
+        }
+        self.save();
+        info!("user (pane={}, from_user={from_user}) ewma={:.3}",
+            if pane.is_empty() { "unchanged" } else { pane },
+            self.activity_ewma);
+    }
+
+    pub fn handle_response(&mut self, pane: &str) {
+        let turn_duration = now() - self.turn_start;
+        self.decay_ewma();
+        self.boost_ewma(turn_duration);
+        self.in_turn = false;
+        self.last_response = now();
+        self.fired = false;
+        if !pane.is_empty() {
+            self.claude_pane = Some(pane.to_string());
+        }
+        self.save();
+        info!("response (turn={:.1}s) ewma={:.3}", turn_duration, self.activity_ewma);
+    }
+
+    /// Check if a notification should trigger a tmux prompt.
+    /// Called when a notification arrives via module channel.
+    /// Only injects into tmux when idle — if there's an active session
+    /// (recent user or response), the hook delivers via additionalContext.
+    pub fn maybe_prompt_notification(&mut self, ntype: &str, urgency: u8, _message: &str) {
+        if self.user_present() {
+            return; // hook will deliver it on next prompt
+        }
+        // If we've responded recently, the session is active —
+        // notifications will arrive via hook, no need to wake us
+        let since_response = now() - self.last_response;
+        if since_response < self.notify_timeout {
+            return;
+        }
+        // Don't send notifications via tmux directly — they flow
+        // through the idle nudge. Urgent notifications reset the
+        // idle timer so the nudge fires sooner.
+        let effective = self.notifications.threshold_for(ntype);
+        if urgency >= effective && self.fired {
+            // Bump: allow the nudge to re-fire for urgent notifications
+            self.fired = false;
+        }
+    }
+
+    pub fn handle_afk(&mut self) {
+        // Push last_user_msg far enough back that user_present() returns false
+        self.last_user_msg = now() - self.session_active_secs - 1.0;
+        self.fired = false; // allow idle timer to fire again
+        info!("User marked AFK");
+        self.save();
+    }
+
+    pub fn handle_session_timeout(&mut self, secs: f64) {
+        self.session_active_secs = secs;
+        info!("session active timeout = {secs}s");
+        self.save();
+    }
+
+    pub fn handle_idle_timeout(&mut self, secs: f64) {
+        self.idle_timeout = secs;
+        self.save();
+        info!("idle timeout = {secs}s");
+    }
+
+    pub fn handle_ewma(&mut self, value: f64) -> f64 {
+        if value >= 0.0 {
+            self.activity_ewma = value.min(1.0);
+            self.ewma_updated_at = now();
+            self.save();
+            info!("ewma set to {:.3}", self.activity_ewma);
+        }
+        self.activity_ewma
+    }
+
+    pub fn handle_notify_timeout(&mut self, secs: f64) {
+        self.notify_timeout = secs;
+        self.save();
+        info!("notify timeout = {secs}s");
+    }
+
+    pub fn handle_sleep(&mut self, until: f64) {
+        if until == 0.0 {
+            self.sleep_until = Some(0.0);
+            info!("sleep indefinitely");
+        } else {
+            self.sleep_until = Some(until);
+            info!("sleep until {until}");
+        }
+        self.notifications.set_activity(notify::Activity::Sleeping);
+        self.save();
+    }
+
+    pub fn handle_wake(&mut self) {
+        self.sleep_until = None;
+        self.fired = false;
+        self.save();
+        info!("wake");
+    }
+
+    pub fn handle_quiet(&mut self, seconds: u32) {
+        self.quiet_until = now() + seconds as f64;
+        info!("quiet {seconds}s");
+    }
+
+    pub fn user_present(&self) -> bool {
+        (now() - self.last_user_msg) < self.session_active_secs
+    }
+
+    /// Seconds since the most recent of user message or response.
+    pub fn since_activity(&self) -> f64 {
+        let reference = self.last_response.max(self.last_user_msg);
+        if reference > 0.0 { now() - reference } else { 0.0 }
+    }
+
+    /// Why the idle timer hasn't fired (or "none" if it would fire now).
+    pub fn block_reason(&self) -> &'static str {
+        let t = now();
+        if self.fired {
+            "already fired"
+        } else if self.sleep_until.is_some() {
+            "sleeping"
+        } else if t < self.quiet_until {
+            "quiet mode"
+        } else if self.consolidating {
+            "consolidating"
+        } else if self.dreaming {
+            "dreaming"
+        } else if self.user_present() {
+            "user present"
+        } else if self.in_turn {
+            "in turn"
+        } else if self.last_response.max(self.last_user_msg) == 0.0 {
+            "no activity yet"
+        } else if self.since_activity() < self.idle_timeout {
+            "not idle long enough"
+        } else {
+            "none — would fire"
+        }
+    }
+
+    /// Full debug dump as JSON with computed values.
+    pub fn debug_json(&self) -> String {
+        let t = now();
+        let since_user = t - self.last_user_msg;
+        let since_response = t - self.last_response;
+
+        serde_json::json!({
+            "now": t,
+            "uptime": t - self.start_time,
+            "idle_timeout": self.idle_timeout,
+            "notify_timeout": self.notify_timeout,
+            "last_user_msg": self.last_user_msg,
+            "last_user_msg_ago": since_user,
+            "last_user_msg_time": epoch_to_iso(self.last_user_msg),
+            "last_response": self.last_response,
+            "last_response_ago": since_response,
+            "last_response_time": epoch_to_iso(self.last_response),
+            "since_activity": self.since_activity(),
+            "activity_ewma": self.activity_ewma,
+            "in_turn": self.in_turn,
+            "turn_start": self.turn_start,
+            "user_present": self.user_present(),
+            "claude_pane": self.claude_pane,
+            "fired": self.fired,
+            "block_reason": self.block_reason(),
+            "sleep_until": self.sleep_until,
+            "quiet_until": self.quiet_until,
+            "consolidating": self.consolidating,
+            "dreaming": self.dreaming,
+            "dream_start": self.dream_start,
+            "activity": format!("{:?}", self.notifications.activity),
+            "pending_notifications": self.notifications.pending.len(),
+            "notification_types": self.notifications.types.len(),
+        }).to_string()
+    }
+
+    pub fn send(&self, msg: &str) -> bool {
+        let pane = match &self.claude_pane {
+            Some(p) => p.clone(),
+            None => match tmux::find_claude_pane() {
+                Some(p) => p,
+                None => {
+                    info!("send: no claude pane found");
+                    return false;
+                }
+            },
+        };
+
+        let ok = tmux::send_prompt(&pane, msg);
+        let preview: String = msg.chars().take(80).collect();
+        info!("send(pane={pane}, ok={ok}): {preview}");
+        ok
+    }
+
+    fn check_dream_nudge(&self) -> bool {
+        if !self.dreaming || self.dream_start == 0.0 {
+            return false;
+        }
+        let minutes = (now() - self.dream_start) / 60.0;
+        if minutes >= 60.0 {
+            self.send(
+                "You've been dreaming for over an hour. Time to surface \
+                 — run dream-end.sh and capture what you found.",
+            );
+        } else if minutes >= 45.0 {
+            self.send(&format!(
+                "Dreaming for {:.0} minutes now. Start gathering your threads \
+                 — you'll want to surface soon.",
+                minutes
+            ));
+        } else if minutes >= 30.0 {
+            self.send(&format!(
+                "You've been dreaming for {:.0} minutes. \
+                 No rush — just a gentle note from the clock.",
+                minutes
+            ));
+        } else {
+            return false;
+        }
+        true
+    }
+
+    pub fn build_context(&mut self, include_irc: bool) -> String {
+        // Ingest any legacy notification files
+        self.notifications.ingest_legacy_files();
+        let notif_text = self.notifications.format_pending(notify::AMBIENT);
+        context::build(include_irc, &notif_text)
+    }
+
+    pub async fn tick(&mut self) -> Result<(), String> {
+        let t = now();
+        let h = home();
+
+        // Decay EWMA on every tick
+        self.decay_ewma();
+
+        // Ingest legacy notification files every tick
+        self.notifications.ingest_legacy_files();
+
+        // Sleep mode
+        if let Some(wake_at) = self.sleep_until {
+            if wake_at == 0.0 {
+                return Ok(()); // indefinite
+            }
+            if t < wake_at {
+                return Ok(());
+            }
+            // Wake up
+            info!("sleep expired, waking");
+            self.sleep_until = None;
+            self.fired = false;
+            self.save();
+            let ctx = self.build_context(true);
+            let extra = if ctx.is_empty() {
+                String::new()
+            } else {
+                format!("\n{ctx}")
+            };
+            self.send(&format!(
+                "Wake up. Read your journal (poc-memory journal-tail 10), \
+                 check work-queue.md, and follow what calls to you.{extra}"
+            ));
+            return Ok(());
+        }
+
+        // Quiet mode
+        if t < self.quiet_until {
+            return Ok(());
+        }
+
+        // Consolidation
+        if self.consolidating {
+            return Ok(());
+        }
+
+        // Dream loop (externally managed)
+        if h.join(".consciousness/agents/dream-loop-active").exists() {
+            return Ok(());
+        }
+
+        // Dream nudges
+        if self.dreaming {
+            self.check_dream_nudge();
+            return Ok(());
+        }
+
+        // Don't nudge while User is here — conversation drives activity
+        if self.user_present() {
+            return Ok(());
+        }
+
+        // Don't nudge while in a turn
+        if self.in_turn {
+            return Ok(());
+        }
+
+        // Minimum interval between nudges
+        let since_nudge = t - self.last_nudge;
+        if since_nudge < MIN_NUDGE_INTERVAL {
+            return Ok(());
+        }
+
+        // Initial idle timeout — don't start nudging until first idle period
+        let reference = self.last_response.max(self.last_user_msg);
+        if reference == 0.0 {
+            return Ok(());
+        }
+        let elapsed = t - reference;
+        if elapsed < self.idle_timeout {
+            return Ok(());
+        }
+
+        // Transition to idle — lower notification thresholds
+        if self.notifications.activity != notify::Activity::Idle {
+            self.notifications.set_activity(notify::Activity::Idle);
+        }
+
+        // Fire
+        let elapsed_min = (elapsed / 60.0) as u64;
+        let ctx = self.build_context(true);
+        let extra = if ctx.is_empty() {
+            String::new()
+        } else {
+            format!("\n{ctx}")
+        };
+
+        let dream_hours = hours_since_last_dream();
+        let mut msg = format!(
+            "This is your autonomous time (User AFK {elapsed_min}m). \
+             Keep doing what you're doing, or find something new to do");
+        if dream_hours >= DREAM_INTERVAL_HOURS {
+            msg.push_str(&format!(
+                " You haven't dreamed in {dream_hours} hours — \
+                 consider running ~/.consciousness/tools/dream-start.sh \
+                 and spending some time in dreaming mode. \
+                 Or do whatever calls to you."));
+        }
+        let msg = format!("{msg}{extra}");
+
+        if self.send(&msg) {
+            self.last_nudge = t;
+            self.fired = true;
+        }
+
+        Ok(())
+    }
+
+}
+
+fn hours_since_last_dream() -> u64 {
+    let path = home().join(".consciousness/logs/dream-log.jsonl");
+    let content = match fs::read_to_string(path) {
+        Ok(c) if !c.is_empty() => c,
+        _ => return 999,
+    };
+
+    let last_line = match content.lines().last() {
+        Some(l) => l,
+        None => return 999,
+    };
+
+    let parsed: serde_json::Value = match serde_json::from_str(last_line) {
+        Ok(v) => v,
+        Err(_) => return 999,
+    };
+
+    let end_str = match parsed.get("end").and_then(|v| v.as_str()) {
+        Some(s) => s,
+        None => return 999,
+    };
+
+    // Parse ISO 8601 timestamp manually (avoid chrono dependency)
+    // Format: "2025-03-04T10:30:00Z" or "2025-03-04T10:30:00+00:00"
+    let end_str = end_str.replace('Z', "+00:00");
+    // Use the system date command as a simple parser
+    let out = std::process::Command::new("date")
+        .args(["-d", &end_str, "+%s"])
+        .output()
+        .ok()
+        .and_then(|o| String::from_utf8(o.stdout).ok())
+        .and_then(|s| s.trim().parse::<f64>().ok());
+
+    match out {
+        Some(end_epoch) => ((now() - end_epoch) / 3600.0) as u64,
+        None => 999,
+    }
+}