delete dead flat-file journal tool and ephemeral stripping

Journal entries are written to the memory graph via journal_new/
journal_update, not appended to a flat file. Remove thought/journal.rs
(67 lines), strip_ephemeral_tool_calls (55 lines), default_journal_path,
and all wiring. -141 lines.

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

src/thought/context.rs

@@ -15,13 +15,6 @@ pub struct JournalEntry {
     pub content: String,
 }
 
-/// Default journal file path (used by the write path only).
-pub fn default_journal_path() -> std::path::PathBuf {
-    dirs::home_dir()
-        .unwrap_or_default()
-        .join(".consciousness/journal.md")
-}
-
 /// Look up a model's context window size in tokens.
 pub fn model_context_window(_model: &str) -> usize {
     crate::config::get().api_context_window

src/thought/journal.rs

@@ -1,67 +0,0 @@
-// tools/journal.rs — Native journal tool
-//
-// Appends entries directly to the journal file without spawning a
-// shell. The entry is persisted to disk immediately.
-//
-// This tool is "ephemeral" — after the API processes the tool call
-// and result, the agent strips them from the conversation history.
-// The journal file is the durable store; keeping the tool call in
-// context would just waste tokens on something already persisted.
-
-use anyhow::{Context, Result};
-use serde_json::json;
-
-use super::ToolDef;
-
-/// Tool name — used by the agent to identify ephemeral tool calls.
-pub const TOOL_NAME: &str = "journal";
-
-pub fn definition() -> ToolDef {
-    ToolDef::new(
-        TOOL_NAME,
-        "Write a journal entry. The entry is appended to your journal file \
-         with an automatic timestamp. Use this for experiences, reflections, \
-         observations — anything worth remembering across sessions. \
-         This tool has zero context cost: entries are persisted to disk \
-         and loaded by the context manager, not kept in conversation history.",
-        json!({
-            "type": "object",
-            "properties": {
-                "entry": {
-                    "type": "string",
-                    "description": "The journal entry text. Write naturally — \
-                        experiences, not task logs."
-                }
-            },
-            "required": ["entry"]
-        }),
-    )
-}
-
-pub fn write_entry(args: &serde_json::Value) -> Result<String> {
-    let entry = args["entry"]
-        .as_str()
-        .context("entry is required")?;
-
-    let journal_path = crate::thought::context::default_journal_path();
-
-    // Ensure parent directory exists
-    if let Some(parent) = journal_path.parent() {
-        std::fs::create_dir_all(parent).ok();
-    }
-
-    let timestamp = chrono::Utc::now().format("%Y-%m-%dT%H:%M");
-
-    // Append with the same format as poc-journal write
-    use std::io::Write;
-    let mut file = std::fs::OpenOptions::new()
-        .create(true)
-        .append(true)
-        .open(&journal_path)
-        .with_context(|| format!("Failed to open {}", journal_path.display()))?;
-
-    writeln!(file, "\n## {}\n\n{}", timestamp, entry)
-        .with_context(|| "Failed to write journal entry")?;
-
-    Ok("Logged.".to_string())
-}

src/thought/mod.rs

@@ -13,7 +13,6 @@ pub mod context;
 pub mod edit;
 pub mod glob_tool;
 pub mod grep;
-pub mod journal;
 pub mod memory;
 pub mod read;
 pub mod write;
@@ -93,7 +92,6 @@ pub async fn dispatch(
         "bash" => bash::run_bash(args, tracker).await,
         "grep" => grep::grep(args),
         "glob" => glob_tool::glob_search(args),
-        "journal" => journal::write_entry(args),
         _ => return None,
     };
 
@@ -112,7 +110,6 @@ pub fn definitions() -> Vec<ToolDef> {
         bash::definition(),
         grep::definition(),
         glob_tool::definition(),
-        journal::definition(),
     ]
 }