Enhance tool documentation and add new features

- Added module-level documentation for memory tools (`remember`, `recall`, `forget`) to clarify their purpose.
- Improved documentation in `recall.rs` and `remember.rs` to describe the functionality and flow of memory entry operations.
- Updated `mod.rs` to include descriptions for the tool trait and execution context.
- Enhanced `plan.rs` with detailed comments on plan-mode signaling tools.
- Documented text search tools in `search.rs` to explain their functionality.
- Improved sequential-thinking tool documentation in `seqthink.rs`.
- Added safety filter documentation in `shell_filter` for credential and git operations.
- Enhanced utility tools documentation, including `cd`, `dir_cache_update`, and `todowrite`.
- Improved rendering documentation in view modules (`chat`, `markdown`, `status`, `workflow`) to clarify rendering flows and purposes.

src/view/status.rs

@@ -1,3 +1,13 @@
+//! Status bar rendering for the TUI.
+//!
+//! Flow: `draw_status_bar` reads live connection/turn state off
+//! `AppStateRest` every frame and paints a single-line bar at the top
+//! (or bottom, per layout) of the screen showing agent status, provider,
+//! and model.
+//!
+//! Why: kept as one small, self-contained render function rather than a
+//! widget struct, matching the other `view/*` modules' functional style.
+
 use ratatui::layout::Rect;
 use ratatui::style::{Style, Modifier};
 use ratatui::text::{Line, Span};
@@ -5,6 +15,13 @@ use ratatui::widgets::Block;
 use ratatui::Frame;
 use super::theme::Theme;
 
+/// Render the single-line status bar showing connection state, provider, and model.
+///
+/// Flow: derive an agent status label/color from turn-in-flight and API
+/// connection state → build left ([zesdex] STATUS) and right
+/// (provider · model) span groups → render as one styled Line.
+///
+/// Return: nothing; draws directly into `frame` at `area`.
 pub fn draw_status_bar(frame: &mut Frame, area: Rect, state: &crate::app::state::rest::AppStateRest) {
     // Connection status — reflects actual agent readiness:
     //   PROG  → turn is in flight