Reduce pub visibility: hippocampus, subconscious internals

hippocampus: cursor navigation, transcript parsing, similarity
functions to pub(crate). counters::open() made private.

subconscious: all format_* prompts helpers to pub(super),
load_defs and keys_to_replay_items made private,
consolidate_full_with_progress made private.

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

src/subconscious/defs.rs

@@ -163,7 +163,7 @@ pub fn agents_dir() -> PathBuf {
 }
 
 /// Load all agent definitions.
-pub fn load_defs() -> Vec<AgentDef> {
+fn load_defs() -> Vec<AgentDef> {
     let dir = agents_dir();
     let Ok(entries) = std::fs::read_dir(&dir) else { return Vec::new() };
 
@@ -814,7 +814,7 @@ pub fn run_agent(
 }
 
 /// Convert a list of keys to ReplayItems with priority and graph metrics.
-pub fn keys_to_replay_items(
+fn keys_to_replay_items(
     store: &Store,
     keys: &[String],
     graph: &Graph,