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-memory/src/agents/knowledge.rs

@@ -125,7 +125,7 @@ pub fn run_one_agent_excluded(
 }
 
 fn run_one_agent_inner(
-    store: &mut Store,
+    _store: &mut Store,
     agent_name: &str,
     def: &super::defs::AgentDef,
     agent_batch: super::prompts::AgentBatch,

poc-memory/src/agents/prompts.rs

@@ -3,7 +3,6 @@
 
 use crate::store::Store;
 use crate::graph::Graph;
-use crate::similarity;
 
 use crate::neuro::{
     ReplayItem,

poc-memory/src/neuro/scoring.rs

@@ -249,7 +249,7 @@ fn consolidation_plan_inner(store: &Store, detect_interf: bool) -> Consolidation
     let graph = store.build_graph();
     let alpha = graph.degree_power_law_exponent();
     let gini = graph.degree_gini();
-    let avg_cc = graph.avg_clustering_coefficient();
+    let _avg_cc = graph.avg_clustering_coefficient();
     let interference_count = if detect_interf {
         detect_interference(store, &graph, 0.5).len()
     } else {
@@ -259,7 +259,7 @@ fn consolidation_plan_inner(store: &Store, detect_interf: bool) -> Consolidation
     let episodic_count = store.nodes.iter()
         .filter(|(_, n)| matches!(n.node_type, crate::store::NodeType::EpisodicSession))
         .count();
-    let episodic_ratio = if store.nodes.is_empty() { 0.0 }
+    let _episodic_ratio = if store.nodes.is_empty() { 0.0 }
         else { episodic_count as f32 / store.nodes.len() as f32 };
 
     let mut plan = ConsolidationPlan {

poc-memory/src/store/persist.rs

@@ -16,7 +16,7 @@ use capnp::serialize;
 
 use std::collections::HashMap;
 use std::fs;
-use std::io::{BufReader, BufWriter, Seek};
+use std::io::{BufReader, Seek};
 use std::path::Path;
 
 impl Store {
@@ -841,7 +841,7 @@ pub fn strip_md_keys() -> Result<(), String> {
 // back up first, preserve history, and never write from a potentially
 // incomplete in-memory snapshot.
 #[allow(dead_code)]
-fn _rewrite_store_DISABLED(_store: &Store) -> Result<(), String> {
+fn _rewrite_store_disabled(_store: &Store) -> Result<(), String> {
     panic!("rewrite_store is disabled — see comment above");
 }
 

poc-memory/src/store/types.rs

@@ -26,7 +26,7 @@ use std::time::{SystemTime, UNIX_EPOCH};
 macro_rules! capnp_enum {
     ($rust_type:ident, $capnp_type:path, [$($variant:ident),+ $(,)?]) => {
         impl $rust_type {
-            #[allow(clippy::wrong_self_convention)]
+            #[allow(clippy::wrong_self_convention, dead_code)]
             pub(crate) fn to_capnp(&self) -> $capnp_type {
                 match self {
                     $(Self::$variant => <$capnp_type>::$variant,)+