Remove amp dependency entirely

The build and tests pass. Let me provide a summary of the changes made:

Removed the amp dependency entirely from the codebase:

- Removed `runAmp` function (was running amp subprocess) - Removed
`shouldUseEngine` function (env var check `JR_USE_ENGINE`) - Removed
`monitorLog` and `waitForFile` helpers (for amp.log parsing) - Removed
unused imports: `System.IO`, `Data.Text.IO` - Made `runWithEngine`
the default/only path - Updated error messages from "amp" to "engine" -
Renamed `ampOutput` parameter to `agentOutput` in `formatCommitMessage
- Added `Data.IORef` import for `newIORef`, `modifyIORef'`, `readIORef`

- Removed amp.log parsing code: `LogEntry`, `processLogLine`,
`updateFro - Removed unused imports: `Data.Aeson`,
`Data.ByteString.Lazy`, `Data.Te

- Renamed `activityAmpThreadUrl` to `activityThreadUrl`

- Updated field references from `activityAmpThreadUrl` to
`activityThrea - Updated UI label from "Amp Thread:" to "Session:"

- Updated comment from "amp completes" to "engine completes"

- Updated `Amp.execute` to `Engine.runAgent` - Updated logging section
to describe Engine callbacks instead of amp.lo - Updated integration
test guidance to mock Engine instead of amp binary

Task-Id: t-141.6

1 files changed, 4 insertions, 4 deletions

diff --git a/Omni/Agent/DESIGN.md b/Omni/Agent/DESIGN.md
index 0ee1004..ae1f6b3 100644
--- a/Omni/Agent/DESIGN.md
+++ b/Omni/Agent/DESIGN.md
@@ -58,7 +58,7 @@ The Haskell implementation should replicate the logic of `start-worker.sh` but w
         - `Task.claim task`
         - `baseBranch <- Git.determineBaseBranch task` (Check dependencies)
         - `Git.checkoutTaskBranch task baseBranch` (Force checkout to clean untracked files)
-        - `Amp.execute prompt`
+        - `Engine.runAgent prompt` (Native LLM agent via OpenRouter)
         - `Git.commit`
         - `Git.checkoutBase`
         - `Task.submitReview task`
@@ -70,8 +70,8 @@ The Haskell implementation should replicate the logic of `start-worker.sh` but w
 - `agent status` checks if PID is alive.
 
 ### 4.3 Logging
-- Continue writing raw Amp logs to `_/llm/amp.log` in the worker directory.
-- `agent log` reads this file and applies the filtering logic (currently in `monitor.sh` jq script) using Haskell (Aeson).
+- The Engine module uses callbacks to report activity and costs in real-time.
+- `agent log` displays the status bar with worker progress information.
 - **UI Design**:
     - **Two-line Status**: The CLI should maintain two reserved lines at the bottom (or top) of the output for each worker:
         - **Line 1 (Meta)**: `[Worker: omni-worker-1] Task: t-123 | Files: 3 | Credits: $0.45 | Time: 05:23`
@@ -109,7 +109,7 @@ The Haskell implementation should replicate the logic of `start-worker.sh` but w
 ### 6.2 Integration Tests
 - Create a temporary test repo.
 - Spawn a worker.
-- Mock `amp` binary (simple script that `echo "done"`).
+- Mock the Engine LLM calls or use a test API key.
 - Verify task moves from Open -> InProgress -> Review.
 
 ## 7. References