Rename task update tool to patch_tasks

README.md

@@ -8,7 +8,7 @@ Hierarchical, session-local task tracking for [Pi](https://pi.dev), with atomic
 
 ## Features
 
-- Five focused tools: `set_tasks`, `update_task`, `rm_task`, `list_task`, and `get_task`
+- Five focused tools: `set_tasks`, `patch_tasks`, `rm_task`, `list_task`, and `get_task`
 - Parent/child task trees with generated integer IDs and atomic append/replace modes
 - Atomic batch mutations: every requested change succeeds or none of it is applied
 - Bounded task input and widget output to keep sessions and terminals responsive
@@ -57,7 +57,7 @@ After automatic or manual context compaction, the extension sends one short hidd
 | Tool | Parameters | Behavior |
 | --- | --- | --- |
 | `set_tasks` | `{ mode, tasks, force }` | `append` extends the tree with `force: false`; `replace` atomically installs a new tree or clears it with `[]`. Replacing unfinished work requires `force: true`. |
-| `update_task` | `{ tasks: [...] }` | Atomically patches multiple tasks. Use `null` for unchanged text/status, `parentId: -1` for unchanged or `0` to move to root, and `position: -1` to keep the current order. |
+| `patch_tasks` | `{ tasks: [...] }` | Atomically patches multiple tasks. Use `null` for unchanged text/status, `parentId: -1` for unchanged or `0` to move to root, and `position: -1` to keep the current order. Completed trees may auto-clear; do not recreate cleared completed tasks. |
 | `rm_task` | `{ ids: [...], reason }` | Removes only mistaken, duplicate, or canceled tasks. Removing a parent cascades through its descendants. |
 | `list_task` | `{}` | Returns the full tree as compact `id/status/name` lines. |
 | `get_task` | `{ ids: [...] }` | Returns complete task details, including parent/child IDs and timing for tasks that have started. |