perf(agent): eksekusi tool read-only paralel seperti Claude Code

Sebelumnya loop utama mengeksekusi semua tool call satu-per-satu
(sequential for loop). Seperti Claude Code, tool read-only yang
independen dalam satu pesan assistant (read/grep/glob/semantic_search
dsb.) kini dijalankan konkuren dengan bounded parallelism (max 8),
mengurangi latensi per turn secara signifikan untuk beban coding.

- feat(registry): tool_is_parallel_safe() — whitelist tool read-only
  yang aman dijalankan paralel; tool mutating/shell tetap sequential
- feat(executor): is_parallel_safe() delegasi ke registry; ToolExecutor
  trait Default=false (konservatif)
- fix(application): execute_tool_calls_in_parallel() — join_all +
  semaphore bounded 8, hasil dikumpulkan dalam URUTAN panggilan asli
  (kontrak OpenAI/Anthropic tool-result ordering)
- loop utama: batch paralel hanya jika SEMUA tool parallel-safe; jika
  ada satu tool mutating, jatuh balik ke jalur sequential aman
- test: +2 registry test, +2 application test (konkurensi & urutan,
  fallback batch mutating)

apps/infrastructure/src/tools/mod.rs

@@ -59,7 +59,7 @@ pub mod workflow;
 // like `crate::tools::{Tool, ToolCtx}` continue to work.
 pub use context::{ToolCtx, ToolCtxBuilder};
 pub use graduated::{check_graduated_checks, GraduatedCheck};
-pub use registry::{all_tools, tool_defs, tool_is_risky};
+pub use registry::{all_tools, tool_defs, tool_is_parallel_safe, tool_is_risky};
 pub use util::{arg_str, execute_cmd, log_write_edit_tool, resolve_path};
 
 /// Common interface every agent-invocable tool implements.