skill: run workers in background for real-time monitoring

Add run_in_background=true to worker dispatch so the user can
tail -f the output file to observe the worker's full transcript
(tool calls, reasoning, output) in real time.

Changes:
- Add TaskOutput to allowed-tools
- Add "Monitoring Workers" section with tail -f instructions
- Update Step 3 to use run_in_background=true and TaskOutput

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

stage0/.claude/skills/enable-tests/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: enable-tests
 description: Sequentially enable disabled tests, fixing divergences by mechanical porting from upstream, and commit.
-allowed-tools: Read, Write, Edit, Bash, Grep, Glob, Task
+allowed-tools: Read, Write, Edit, Bash, Grep, Glob, Task, TaskOutput
 disable-model-invocation: true
 ---
 
@@ -44,6 +44,20 @@ Zig/C code, or edit C source files. The worker handles all of that.
    test file for each small piece, implement them, and build back up until the
    corpus test passes. See "Drill-Down Strategy" below.
 
+## Monitoring Workers
+
+Workers run in the background so the user can observe their progress.
+After dispatching a worker, **always** print the output file path:
+
+```
+Worker output: <output_file>
+Monitor with: tail -f <output_file>
+```
+
+Then wait for the result using `TaskOutput` with `block=true`. The user
+can `tail -f` the output file in another terminal to watch the worker's
+full transcript (tool calls, reasoning, output) in real time.
+
 ## File Configuration
 
 Based on the test file argument, look up which files are in scope:
@@ -161,11 +175,16 @@ when you have accumulated ~10 passing tests, flush the batch:
    - Key reference files (from the configuration table above)
    - If this is a retry after `progress`, include the previous worker's
      COMMIT_MSG so the new worker knows what was already done.
-3. Launch via the Task tool:
+3. Launch via the Task tool with `run_in_background=true`:
    ```
    subagent_type=general-purpose
    prompt=<the worker prompt with context filled in>
+   run_in_background=true
    ```
+4. Print the `output_file` path from the Task result so the user can
+   monitor with `tail -f <output_file>`.
+5. Wait for the worker to finish using `TaskOutput` with `block=true`
+   on the returned task ID.
 
 ### Step 4: Handle worker result