[#79] JSONL Scorecard Generator for overnight loop analysis

Generates comprehensive reports from overnight loop JSONL data:

**Features:**
- Reads ~/shared/overnight-loop/*.jsonl
- Produces JSON and Markdown reports
- Pass/fail statistics with pass rates
- Duration analysis (avg, median, p95)
- Per-task breakdowns
- Hourly timeline trends
- Error pattern analysis
- Auto-generated recommendations

**Reports:**
- ~/timmy/reports/scorecard_YYYYMMDD.json (structured)
- ~/timmy/reports/scorecard_YYYYMMDD.md (human-readable)

**Usage:**
  python uni-wizard/scripts/generate_scorecard.py

Closes #79

docs/SCORECARD.md

@@ -0,0 +1,125 @@
+# Scorecard Generator Documentation
+
+## Overview
+
+The Scorecard Generator analyzes overnight loop JSONL data and produces comprehensive reports with statistics, trends, and recommendations.
+
+## Usage
+
+### Basic Usage
+
+```bash
+# Generate scorecard from default input directory
+python uni-wizard/scripts/generate_scorecard.py
+
+# Specify custom input/output directories
+python uni-wizard/scripts/generate_scorecard.py \
+    --input ~/shared/overnight-loop \
+    --output ~/timmy/reports
+```
+
+### Cron Setup
+
+```bash
+# Generate scorecard every morning at 6 AM
+0 6 * * * /root/timmy/venv/bin/python /root/timmy/uni-wizard/scripts/generate_scorecard.py
+```
+
+## Input Format
+
+JSONL files in `~/shared/overnight-loop/*.jsonl`:
+
+```json
+{"task": "read-soul", "status": "pass", "duration_s": 19.7, "timestamp": "2026-03-29T21:54:12Z"}
+{"task": "check-health", "status": "fail", "duration_s": 5.2, "error": "timeout", "timestamp": "2026-03-29T22:15:33Z"}
+```
+
+Fields:
+- `task`: Task identifier
+- `status`: "pass" or "fail"
+- `duration_s`: Execution time in seconds
+- `timestamp`: ISO 8601 timestamp
+- `error`: Error message (for failed tasks)
+
+## Output
+
+### JSON Report
+
+`~/timmy/reports/scorecard_YYYYMMDD.json`:
+
+```json
+{
+  "generated_at": "2026-03-30T06:00:00Z",
+  "summary": {
+    "total_tasks": 100,
+    "passed": 95,
+    "failed": 5,
+    "pass_rate": 95.0,
+    "duration_stats": {
+      "avg": 12.5,
+      "median": 10.2,
+      "p95": 45.0,
+      "min": 1.2,
+      "max": 120.5
+    }
+  },
+  "by_task": {...},
+  "by_hour": {...},
+  "errors": {...},
+  "recommendations": [...]
+}
+```
+
+### Markdown Report
+
+`~/timmy/reports/scorecard_YYYYMMDD.md`:
+
+- Executive summary with pass/fail counts
+- Duration statistics (avg, median, p95)
+- Per-task breakdown with pass rates
+- Hourly timeline showing performance trends
+- Error analysis with frequency counts
+- Actionable recommendations
+
+## Report Interpretation
+
+### Pass Rate Thresholds
+
+| Pass Rate | Status | Action |
+|-----------|--------|--------|
+| 95%+ | ✅ Excellent | Continue current operations |
+| 85-94% | ⚠️ Good | Monitor for degradation |
+| 70-84% | ⚠️ Fair | Review failing tasks |
+| <70% | ❌ Poor | Immediate investigation required |
+
+### Duration Guidelines
+
+| Duration | Assessment |
+|----------|------------|
+| <5s | Fast |
+| 5-15s | Normal |
+| 15-30s | Slow |
+| >30s | Very slow - consider optimization |
+
+## Troubleshooting
+
+### No JSONL files found
+
+```bash
+# Check input directory
+ls -la ~/shared/overnight-loop/
+
+# Ensure Syncthing is syncing
+systemctl status syncthing@root
+```
+
+### Malformed lines
+
+The generator skips malformed lines with a warning. Check the JSONL files for syntax errors.
+
+### Empty reports
+
+If no data exists, verify:
+1. Overnight loop is running and writing JSONL
+2. File permissions allow reading
+3. Input path is correct