doc: Remove ideas for full tabular data plans.

docs/DEVPLAN.md

@@ -191,19 +191,26 @@ changes covers the register use case.
 **Done when:** `seq 1 20 | pikl --multi`, toggle a few items
 with Space, confirm, and all selected items appear on stdout.
 
-## Phase 5: Table Mode & CSV
+## Phase 5: Table Mode & CSV ✓
 
-Columnar data display.
+CSV/TSV input parsing and columnar table rendering.
 
 **Deliverables:**
-- `--columns` flag for table layout
-- Auto-alignment
-- Column sorting keybinds
-- `--input-format csv` and `--input-format tsv`
-- Column-specific filtering
+- `--input-format csv` and `--input-format tsv` for delimited input
+- `--columns` flag for table layout with optional aliases
+- Auto-generated column config from CSV headers
+- Column widths computed in core (GUI gets them for free)
+- Table header row with bold/underline styling
+- CSV rows become normal Items (JSON objects), so filtering,
+  field filters, hooks, multi-select, and output all work unchanged
 
-**Done when:** `ps aux | pikl --input-format tsv --columns 1,10,2`
-renders a clean table.
+**Deferred to future:**
+- Cell/column selection in table mode
+- Column sorting keybinds
+- Horizontal scrolling for wide tables
+
+**Done when:** `echo "name,age\nalice,30\nbob,25" | pikl --input-format csv`
+renders a navigable table with headers.
 
 ## Phase 6: Sessions & IPC