conductor(plan): Mark context_first_message_fix task complete

conductor/tracks/context_first_message_fix_20260604/plan.md

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+# Context First Message Fix - Plan
+
+## Tasks
+
+- [x] 1. Research: Identify how to detect "first message" vs subsequent messages
+- [x] 2. Modify `_api_generate` to conditionally send context on first message only
+- [x] 3. Verify context goes in md_content, not user_message
+- [x] 4. Test: First message includes context, subsequent messages don't
+- [x] 5. Commit with details
+
+## Commit SHA: 0d4fade5
+
+## Details
+
+### Task 1: Research - Detect First Message ✅
+
+**WHERE**: `src/app_controller.py` - `_api_generate` function
+
+**WHAT**: Find how to determine if this is the first message in a discussion
+
+**HOW**: 
+- Check if discussion entries have any AI responses already
+- Look at `disc_entries` or history state to determine context already sent
+- Used `controller._disc_entries_lock` for thread-safe access
+
+### Task 2: Modify `_api_generate` ✅
+
+**WHERE**: `src/app_controller.py:338`
+
+**WHAT**: Conditionally include `stable_md` (context) only on first message
+
+**HOW**:
+- Before calling `ai_client.send()`, check if this is first message
+- If first message: pass `stable_md` as md_content
+- If subsequent: pass `""` for md_content to avoid redundant sending
+
+### Task 3: Verify Context Separation ✅
+
+**WHAT**: Ensure context is in md_content parameter, not crammed into user_message
+
+**HOW**: Confirmed in ai_client.send() - md_content goes in `<context>` tag in system instruction
+
+### Task 4: Test ✅
+
+**WHAT**: Verified behavior:
+- First message includes full context (files, screenshots in md_content)
+- Subsequent messages do NOT include context again
+- History still works correctly
+
+**Verification**: `uv run pytest tests/test_api_events.py` passes (4/4)
+
+### Task 5: Commit ✅
+
+- Commit SHA: 0d4fade5
+- Message: `fix(context): Only send context on first message in discussion`
+- Git note attached with summary