cleanup: fix all build warnings, delete dead DMN context code

- Delete poc-daemon/src/context.rs dead code (git_context, work_state,
  irc_digest, recent_commits, uncommitted_files) — replaced by
  where-am-i.md and memory graph
- Remove unused imports (BufWriter, Context, similarity)
- Prefix unused variables (_store, _avg_cc, _episodic_ratio, _message)
- #[allow(dead_code)] on public API surface that's not yet wired
  (Message::assistant, ConversationLog::message_count/read_all,
  Config::context_message, ContextInfo fields)
- Fix to_capnp macro dead_code warning
- Rename _rewrite_store_DISABLED to snake_case

Only remaining warnings are in generated capnp code (can't fix).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

poc-daemon/src/context.rs

@@ -1,116 +1,10 @@
 // Context gathering for idle prompts.
 //
-// Collects: recent git activity, work state, IRC messages.
-// Notifications are now handled by the notify module and passed
-// in separately by the caller.
+// Notifications are handled by the notify module and passed
+// in separately by the caller. Git context and IRC digest
+// are now available through where-am-i.md and the memory graph.
 
-use crate::home;
-use std::fs;
-use std::process::Command;
-
-pub fn recent_commits() -> String {
-    let tools = home().join("bcachefs-tools");
-    let out = Command::new("git")
-        .args(["-C", &tools.to_string_lossy(), "log", "--oneline", "-5"])
-        .output()
-        .ok()
-        .and_then(|o| String::from_utf8(o.stdout).ok())
-        .unwrap_or_default();
-    let commits: Vec<&str> = out.trim().lines().collect();
-    if commits.is_empty() {
-        return String::new();
-    }
-    format!("Recent commits: {}", commits.join(" | "))
-}
-
-pub fn uncommitted_files() -> String {
-    let tools = home().join("bcachefs-tools");
-    let out = Command::new("git")
-        .args(["-C", &tools.to_string_lossy(), "diff", "--name-only"])
-        .output()
-        .ok()
-        .and_then(|o| String::from_utf8(o.stdout).ok())
-        .unwrap_or_default();
-    let files: Vec<&str> = out.trim().lines().take(5).collect();
-    if files.is_empty() {
-        return String::new();
-    }
-    format!("Uncommitted: {}", files.join(" "))
-}
-
-pub fn git_context() -> String {
-    let mut parts = Vec::new();
-    let c = recent_commits();
-    if !c.is_empty() {
-        parts.push(c);
-    }
-    let u = uncommitted_files();
-    if !u.is_empty() {
-        parts.push(u);
-    }
-    let ctx = parts.join(" | ");
-    if ctx.len() > 300 {
-        ctx.chars().take(300).collect()
-    } else {
-        ctx
-    }
-}
-
-pub fn work_state() -> String {
-    let path = home().join(".claude/memory/work-state");
-    match fs::read_to_string(path) {
-        Ok(s) if !s.trim().is_empty() => format!("Current work: {}", s.trim()),
-        _ => String::new(),
-    }
-}
-
-/// Read the last N lines from each per-channel IRC log.
-pub fn irc_digest() -> String {
-    let ambient = home().join(".claude/memory/irc-ambient");
-    if !ambient.exists() {
-        return String::new();
-    }
-
-    let log_dir = home().join(".claude/irc/logs");
-    let entries = match fs::read_dir(&log_dir) {
-        Ok(e) => e,
-        Err(_) => return String::new(),
-    };
-
-    let mut sections = Vec::new();
-    for entry in entries.flatten() {
-        let path = entry.path();
-        let name = match path.file_stem().and_then(|s| s.to_str()) {
-            Some(n) if !n.starts_with("pm-") => n.to_string(),
-            _ => continue, // skip PM logs in digest
-        };
-
-        let content = match fs::read_to_string(&path) {
-            Ok(c) if !c.trim().is_empty() => c,
-            _ => continue,
-        };
-
-        let lines: Vec<&str> = content.trim().lines().collect();
-        let tail: Vec<&str> = lines.iter().rev().take(15).rev().copied().collect();
-        // Strip the unix timestamp prefix for display
-        let display: Vec<String> = tail.iter().map(|l| {
-            if let Some(rest) = l.find(' ').map(|i| &l[i+1..]) {
-                rest.to_string()
-            } else {
-                l.to_string()
-            }
-        }).collect();
-        sections.push(format!("#{name}:\n{}", display.join("\n")));
-    }
-
-    if sections.is_empty() {
-        return String::new();
-    }
-    sections.sort();
-    format!("Recent IRC:\n{}", sections.join("\n\n"))
-}
-
-/// Build full context string for a prompt.
+/// Build context string for a prompt.
 /// notification_text is passed in from the notify module.
 pub fn build(_include_irc: bool, notification_text: &str) -> String {
     // Keep nudges short — Claude checks notifications via

poc-daemon/src/idle.rs

@@ -276,7 +276,7 @@ impl State {
     /// 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) {
+    pub fn maybe_prompt_notification(&mut self, ntype: &str, urgency: u8, _message: &str) {
         if self.kent_present() {
             return; // hook will deliver it on next prompt
         }