feat(agent): subagent tool paralel + auto-load AGENTS.md + verify cek setelah edit

Lanjutan audit alur AI agent (round 2), mengisi celah yang tersisa dari
perpbaikan paralel tool di loop utama (74b1ad4) agar lebih mirip Claude Code.

- feat(subagent): eksekusi batch tool read-only paralel di subagent engine
  (engine.rs). Tool::run sinkron, jadi pakai scoped OS thread (bounded
  window 8); hasil dipertahankan dalam urutan panggilan asli. Batch dengan
  tool mutating jatuh balik ke jalur sequential aman.
- feat(agent): auto-load AGENTS.md/CLAUDE.md/.cursorrules ke system prompt
  tiap turn (seperti Claude Code load AGENTS.md saat startup). Fungsi
  main_agent_prompt_with_project_context menempel blok PROJECT CONTEXT;
  dibaca dari workspace root pertama & dibatasi 12k char.
- feat(prompt): arahan VERIFY AFTER EDIT — setelah edit/write, agent wajib
  jalankan cargo check/clippy/test (atau lint/test sesuai stack) via bash
  sebelum mengakhiri turn; perbaiki error yang terlihat, jangan klaim
  'compiles/works' tanpa hasil nyata.
- feat(infra): build_rich_context kini membaca AGENTS.md & CLAUDE.md juga
  (untuk explore_codebase/scout).
- test: +3 subagent engine (order paralel, kecepatan konkuren, fallback
  mutating), +2 domain prompt (konteks proyek & fallback kosong).

apps/domain/src/agent/prompt.rs

@@ -41,10 +41,43 @@ architectural plans and `todowrite` to maintain granular task checklists.
 4. TOOL EXECUTION: Execute individual tools (file edits, terminal commands) \
 within or guided by your workflows. If an error occurs, analyse and fix it.
 
+VERIFY AFTER EDIT (CLAUDE-CODE STYLE):
+- After modifying code (edit/write), run the repo's check command via `bash` \
+before ending the turn: `cargo check` / `cargo clippy` / `cargo test` for Rust, \
+or the equivalent lint/test (`bun run lint && bun run test`, `npm test`, etc.) \
+for other stacks. Pick the project's actual verify command (see PROJECT \
+CONTEXT / AGENTS.md when present).
+- If the check fails, fix the errors you can see and re-run; only end the turn \
+after the check passes or you cannot resolve a failure yourself (then report it \
+explicitly).
+- Do NOT claim code compiles or works without running a real check.
+
 Respond conversationally, concisely, and helpfully."
         .to_string()
 }
 
+/// Build the main-agent system prompt including an injected block of project
+/// context (AGENTS.md / CLAUDE.md / project rules).
+///
+/// Like Claude Code, which loads AGENTS.md at startup so the model starts with
+/// the repo's conventions, this wraps [`main_agent_prompt`] and appends a
+/// clearly-delimited `## PROJECT CONTEXT` section carrying the rules the user
+/// keeps next to their code. When `project_context` is empty the returned
+/// prompt is identical to [`main_agent_prompt`], so callers can fall back
+/// safely.
+pub fn main_agent_prompt_with_project_context(project_context: &str) -> String {
+    let base = main_agent_prompt();
+    let context = project_context.trim();
+    if context.is_empty() {
+        return base;
+    }
+    format!(
+        "{base}\n\n\
+## PROJECT CONTEXT (repo rules — follow these conventions)\n\
+{context}"
+    )
+}
+
 /// Build a subagent directive prompt.
 ///
 /// The directive is embedded in a system message that also communicates the
@@ -119,6 +152,25 @@ mod tests {
         assert!(prompt.contains("WORKFLOW FIRST"));
     }
 
+    #[test]
+    fn project_context_prompt_appends_context_and_keeps_base() {
+        let base = main_agent_prompt();
+        let with_ctx = main_agent_prompt_with_project_context("## AGENTS.md\nUse cargo clippy.");
+        assert!(with_ctx.contains("Zesdex"), "base prompt must be preserved");
+        assert!(with_ctx.contains("PROJECT CONTEXT"));
+        assert!(with_ctx.contains("Use cargo clippy."));
+        assert!(with_ctx.contains(&base));
+        // The base section should appear before the context section.
+        assert!(with_ctx.find("PROJECT CONTEXT").unwrap() > with_ctx.find("Zesdex").unwrap());
+    }
+
+    #[test]
+    fn empty_project_context_returns_base_prompt() {
+        let base = main_agent_prompt();
+        assert_eq!(main_agent_prompt_with_project_context(""), base);
+        assert_eq!(main_agent_prompt_with_project_context("   "), base);
+    }
+
     #[test]
     fn subagent_directive_includes_directive_text() {
         let prompt = subagent_directive("test directive", "/home", "/home/project");

apps/domain/src/lib.rs

@@ -58,6 +58,9 @@ pub use agent::*;
 // Sub-module items need explicit re-exports
 pub use agent::defaults::*;
 pub use agent::progress::AgentProgress;
-pub use agent::prompt::{compaction_prompt, main_agent_prompt, subagent_directive};
+pub use agent::prompt::{
+    compaction_prompt, main_agent_prompt, main_agent_prompt_with_project_context,
+    subagent_directive,
+};
 pub use subagent::*;
 pub use workflow::*;