docs(mma): Draft Track 4 - Tier 4 QA Interception

conductor/tracks/mma_implementation_20260224/migration_epics.md

@@ -77,3 +77,27 @@
   - Flush history upon \TicketCompleted\.
 
 ### 3. Acceptance Testing Criteria
+- **Unit Tests:** Context generation, API schema mapping, and event-blocking are tested for all Edge cases.
+- **Integration Test:** Manually execute a script pointing the \ConductorEngine\ at a dummy file. The CLI should pause before \write_file\ execution, display the diff, allow manual JSON editing via terminal input, execute the updated JSON file modification, and return \Task Complete\.
+
+## Track 4: Tier 4 QA Interception
+
+**Goal:** Stop error traces from destroying the Worker's token window by routing crashes through a cheap, stateless translator.
+
+### 1. TDD Approach for \shell_runner.py\
+- Create \	ests/test_shell_runner.py\.
+- Write tests that mock a local execution failure (e.g., returning a mock 3000-line Python stack trace).
+- Test that the error is intercepted and passed to a mock Tier 4 agent.
+- Test that the output is compressed into a 20-word fix before returning.
+- **Red Phase:** Fails because no interception loop exists in \shell_runner.py\.
+- **Green Phase:** Implement the try/except logic handling \subprocess.run()\ with \
+eturncode != 0\.
+
+### 2. QA Interception Tasks
+- **Task 4.1: The Interceptor Loop**
+  - Open \shell_runner.py\ and catch execution errors.
+- **Task 4.2: Tier 4 Instantiation**
+  - Construct a secondary, synchronous API call directly to the \default_cheap\ model, sending the raw \stderr\ and the offending code snippet.
+- **Task 4.3: Payload Formatting**
+  - Inject the 20-word fix response from the Tier 4 agent back into the main Tier 3 worker's history context as a system hint.
+