feat(#1653): optional name param for bash run tool

docs/tools/bash.md

@@ -9,7 +9,7 @@ invocation regardless of tool groups.
 
 ## Tools
 
-### `run(cmd, timeout_secs?, wait_seconds?)`
+### `run(cmd, timeout_secs?, wait_seconds?, name?)`
 
 Submit a shell command for background execution (`sh -c <cmd>`).
 Stdout and stderr stream to `harness/bash-tasks/<id>.{out,err}`.
@@ -25,6 +25,14 @@ harness fires a wake with `from: "bash-task-<id>"` and the exit code
   the task keeps running and the normal `task started: id=<id>`
   response is returned. **Defaults to 3** — pass `wait_seconds: 0`
   to disable inline waiting and always get the immediate response.
+- `name` — optional caller-chosen task id. When set it replaces the
+  auto-generated hex id, so it surfaces in the wake `from`
+  (`bash-task-<name>`), in `status(<name>)` lookups, and in the
+  loose-ends list — a memorable label instead of an opaque id. A name
+  is **reusable once its previous task has finished**; submitting a
+  name whose task is still `pending`/`running` is rejected. Allowed
+  characters: ASCII letters, digits, `.`, `_`, `-` (max 64). Omit for
+  the auto-generated id.
 
 Exposed as `mcp__bash__run`.