docs: tambah doc comment, logging, dan inline comments di semua 255 file

Meliputi:
- File-level //! doc comment: tujuan file, alur kerja, komponen utama
- Function-level /// doc comment: apa, parameter, return, flow, edge cases
- Struct/enum/trait /// doc comment: peran, field docs
- Tracing logging (tracing::info!/debug!/trace!/warn!/error!) di setiap fungsi
- Inline comments untuk variable dan branching logic penting
- Seluruh 8 crates di workspace: zesdex-backend, zesdex-cms, zesdex-entities,
  zesdex-iam, zesdex-infra, zesdex-ipc, zesdex-middleware, zesdex-utils
- Build: 0 errors, 242/242 tests passed

crates/zesdex-backend/src/attach.rs

@@ -1,7 +1,19 @@
 //! Attach mode — TUI-only client that connects to an existing daemon session
 //! over a Unix socket, forwarding key events and rendering state updates.
+//!
+//! Flow: `run_attach(session_id)` resolves the daemon's socket path from
+//! the store → `setup_attach_client()` connects and enters raw mode →
+//! enters a render loop: polls for local terminal events (key/resize/paste/
+//! scroll) → forwards them as `ClientRequest`s to the daemon via IPC →
+//! receives a `DaemonFrame` reply → `handle_daemon_frame()` /
+//! `apply_client_update()` applies the state snapshot onto a local
+//! `AppStateRest` mirror → `view::draw()` renders the TUI → on quit,
+//! sends `ClientRequest::Close`, cleans up terminal, and saves settings.
+//!
+//! The client has no agent logic — it is a pure render frontend.
 
 use anyhow::Result;
+use tracing;
 use app::state::rest::AppStateRest;
 use app::state::types::{Overlay, Toast, ToastKind};
 use crossterm::execute;
@@ -31,6 +43,7 @@ use crate::view;
 /// default (`Role::User`, `Overlay::None`, `ToastKind::Info`) rather than
 /// panicking, so a protocol/version mismatch degrades gracefully.
 fn apply_client_update(state: &mut AppStateRest, payload: StatePayload) {
+    tracing::debug!("applying state update from daemon");
     state.session_id = payload.session_id;
     state.dirty = payload.dirty;
 
@@ -105,7 +118,9 @@ fn setup_attach_client(
     Terminal<CrosstermBackend<io::Stdout>>,
     AppStateRest,
 )> {
+    tracing::debug!("setting up attach client for session {session_id}");
     let store = model::store::Store::new();
+    // Resolve the daemon's Unix socket path from store/run/<session_id>.sock
     let socket_path = store
         .base_dir
         .join("run")
@@ -133,6 +148,7 @@ fn setup_attach_client(
 
 /// Process a single daemon frame from the IPC channel, updating state accordingly.
 fn handle_daemon_frame(client_state: &mut AppStateRest, frame: Option<DaemonFrame>) {
+    tracing::debug!("received daemon frame");
     match frame {
         Some(DaemonFrame::StateUpdate(payload)) => {
             apply_client_update(client_state, *payload);