test(trader): add comprehensive unit tests and CI coverage reporting (#823)

* chore(config): add Python and uv support to project

- Add comprehensive Python .gitignore rules (pycache, venv, pytest, etc.)
- Add uv package manager specific ignores (.uv/, uv.lock)
- Initialize pyproject.toml for Python tooling

Co-authored-by: Claude <noreply@anthropic.com>

* chore(deps): add testing dependencies

- Add github.com/stretchr/testify v1.11.1 for test assertions
- Add github.com/agiledragon/gomonkey/v2 v2.13.0 for mocking
- Promote github.com/rs/zerolog to direct dependency

Co-authored-by: Claude <noreply@anthropic.com>

* ci(workflow): add PR test coverage reporting

Add GitHub Actions workflow to run unit tests and report coverage on PRs:
- Run Go tests with race detection and coverage profiling
- Calculate coverage statistics and generate detailed reports
- Post coverage results as PR comments with visual indicators
- Fix Go version to 1.23 (was incorrectly set to 1.25.0)

Coverage guidelines:
- Green (>=80%): excellent
- Yellow (>=60%): good
- Orange (>=40%): fair
- Red (<40%): needs improvement

This workflow is advisory only and does not block PR merging.

Co-authored-by: Claude <noreply@anthropic.com>

* test(trader): add comprehensive unit tests for trader modules

Add unit test suites for multiple trader implementations:
- aster_trader_test.go: AsterTrader functionality tests
- auto_trader_test.go: AutoTrader lifecycle and operations tests
- binance_futures_test.go: Binance futures trader tests
- hyperliquid_trader_test.go: Hyperliquid trader tests
- trader_test_suite.go: Common test suite utilities and helpers

Also fix minor formatting issue in auto_trader.go (trailing whitespace)

Co-authored-by: Claude <noreply@anthropic.com>

* test(trader): preserve existing calculatePnLPercentage unit tests

Merge existing calculatePnLPercentage tests with incoming comprehensive test suite:
- Preserve TestCalculatePnLPercentage with 9 test cases covering edge cases
- Preserve TestCalculatePnLPercentage_RealWorldScenarios with 3 trading scenarios
- Add math package import for floating-point precision comparison
- All tests validate PnL percentage calculation with different leverage scenarios

Co-authored-by: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/pr-go-test-coverage.yml

@@ -0,0 +1,78 @@
+name: Go Test Coverage
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches:
+      - dev
+      - main
+  push:
+    branches:
+      - dev
+      - main
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  test-coverage:
+    name: Go Unit Tests & Coverage
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r .github/workflows/scripts/requirements.txt
+
+      - name: Cache Go modules
+        uses: actions/cache@v4
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Download dependencies
+        run: go mod download
+
+      - name: Run tests with coverage
+        run: |
+          go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+
+      - name: Calculate coverage and generate report
+        id: coverage
+        run: |
+          chmod +x .github/workflows/scripts/calculate_coverage.py
+          python .github/workflows/scripts/calculate_coverage.py coverage.out coverage_report.md
+
+      - name: Comment PR with coverage
+        if: github.event_name == 'pull_request'
+        continue-on-error: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          chmod +x .github/workflows/scripts/comment_pr.py
+          python .github/workflows/scripts/comment_pr.py \
+            ${{ github.event.pull_request.number }} \
+            "${{ steps.coverage.outputs.coverage }}" \
+            "${{ steps.coverage.outputs.emoji }}" \
+            "${{ steps.coverage.outputs.status }}" \
+            "${{ steps.coverage.outputs.badge_color }}" \
+            coverage_report.md