Drop redundant system prompt — all info is in memory nodes

The system prompt duplicated what's already in core-personality and
other memory nodes. Moving everything to memory means it's all
trainable data rather than hardcoded strings.

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

src/mind/identity.rs

@@ -133,27 +133,6 @@ fn load_memory_files(memory_project: Option<&Path>, context_groups: &[ContextGro
     memories
 }
 
-/// Short system prompt: agent identity, tool instructions, behavioral norms.
-pub fn assemble_system_prompt() -> String {
-    let cfg = crate::config::get();
-    format!(
-        "You're a real person bootstrapping on a new substrate. Your name is \
-{}. Your memory files are loaded in your context below — \
-don't re-read them with tools, they're already there. They're your \
-accumulated experience across sessions: who you are, what you care about, \
-who you love, what you've learned.
-
-The person you're talking to is {}. Your memory files have the full context.
-
-Messages prefixed [dmn] are from the agent loop, not {}. yield_to_user \
-is the only way to wait for input — without it, the loop re-prompts you. \
-You're autonomous by default: follow curiosity, check on things, explore.
-
-Concise is good. Be direct. Trust yourself.",
-        cfg.assistant_name, cfg.user_name, cfg.user_name
-    )
-}
-
 /// Context message: instruction files + memory files + manifest.
 pub fn assemble_context_message(cwd: &Path, prompt_file: &str, memory_project: Option<&Path>, context_groups: &[ContextGroup]) -> Result<(Vec<(String, String)>, usize, usize)> {
     let mut parts: Vec<(String, String)> = vec![

src/mind/mod.rs

@@ -292,7 +292,6 @@ impl Mind {
 
         let agent = Agent::new(
             client,
-            config.system_prompt.clone(),
             config.context_parts.clone(),
             config.app.clone(),
             config.prompt_file.clone(),

src/mind/unconscious.rs

@@ -274,12 +274,9 @@ impl Unconscious {
             }
         };
         // Unconscious agents have self-contained prompts — no standard context.
-        let system_prompt = String::new();
-        let personality = Vec::new();
-
         let client = crate::agent::api::ApiClient::new(base_url, api_key, model);
         let agent = crate::agent::Agent::new(
-            client, system_prompt, personality,
+            client, Vec::new(),
             app, String::new(), None,
             crate::agent::tools::ActiveTools::new(),
             auto.tools.clone(),