feat(fe): auto-prepend pinned left No. row-number column in KsDataGrid and harness in AGENTS.md

AGENTS.md

@@ -101,6 +101,7 @@ All work in this repository MUST follow `docs/CURRENT/WBS_EXECUTION_PROCEDURES.m
 - **[CRITICAL IRON RULE] Standardized Loading Skeleton Rule**: ALL screen-level and section-level data loading MUST render animated `SkeletonLoader` (shimmer mode) matching the expected layout (e.g. `skeletonType="table"` for grids, `skeletonType="card"` for forms/summaries) through `QueryStateBoundary`/`StandardScreenBoundary`. Static text ("불러오는 중...") or empty screen placeholders during loading states are STRICTLY PROHIBITED.
 - **[CRITICAL IRON RULE] Standardized Empty Data State Rule**: When zero records or empty dataset states occur, ALL grids, lists, and summary cards MUST render standard `EmptyStatePlaceholder` component (`📭` icon, clear title, descriptive helper text, and optional recovery action button). Blank white spaces or plain `<p>데이터가 없습니다</p>` text tags are STRICTLY PROHIBITED.
 - **[CRITICAL IRON RULE] Standardized UI Component Scale & Density Rule**: ALL UI components (grids, inputs, buttons, select, date fields, cards) MUST strictly inherit central Design System Tokens (`tokens.css` / `base.css`). Custom inline height/font overrides are STRICTLY PROHIBITED. Grid header height (`30px`), row height (`28px`), control height (`28px`), and grid font size (`12px`) MUST be universally uniform across all screens.
+- **[CRITICAL IRON RULE] Standardized Grid Row Numbering Rule**: Unless explicitly disabled (`showRowNumber: false`), ALL data grids MUST automatically prepend a pinned left `No.` column rendering 1-indexed sequential row numbers (`node.rowIndex + 1`) centered with `54px` fixed width.
 
 ## v16.0 Gitea API & CI/CD Automation