Add experiment tracking plan

Document current status, planned experiments, and job tracking
Following REPPO experiment documentation pattern

EXPERIMENT_PLAN.md

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+# DPPO Experiment Plan
+
+## Current Status
+
+### Setup Complete ✅
+- Installation successful on HoReKa with Python 3.10 venv
+- SLURM scripts created for automated job submission
+- All dependencies installed including PyTorch, d4rl, dm-control
+
+### Initial Testing
+🔄 **Job ID 3445081**: Development test (30min) - PENDING
+- Command: `./submit_job.sh dev`
+- Status: Waiting for resources on dev_accelerated partition
+- Purpose: Verify DPPO can run on HoReKa with basic pre-training
+
+## Experiments To Run
+
+### 1. Reproduce Paper Results - Gym Tasks
+
+**Pre-training Phase**:
+- hopper-medium-v2
+- walker2d-medium-v2  
+- halfcheetah-medium-v2
+
+**Fine-tuning Phase**:
+- hopper-v2
+- walker2d-v2
+- halfcheetah-v2
+
+**Settings**: Paper hyperparameters, 3 seeds each
+
+### 2. Additional Environments (Future)
+
+**Robomimic Suite**:
+- lift, can, square, transport
+
+**D3IL Suite**:
+- avoid_m1, avoid_m2, avoid_m3
+
+**Furniture-Bench Suite**:
+- one_leg, lamp, round_table (low/med difficulty)
+
+## Running Experiments
+
+### Quick Development Test
+```bash
+./submit_job.sh dev
+```
+
+### Gym Pre-training
+```bash
+./submit_job.sh gym hopper pretrain
+./submit_job.sh gym walker2d pretrain  
+./submit_job.sh gym halfcheetah pretrain
+```
+
+### Gym Fine-tuning (after pre-training completes)
+```bash
+./submit_job.sh gym hopper finetune
+./submit_job.sh gym walker2d finetune
+./submit_job.sh gym halfcheetah finetune
+```
+
+### Manual SLURM Submission
+```bash
+# With environment variables
+TASK=hopper MODE=pretrain sbatch slurm/run_dppo_gym.sh
+```
+
+## Job Tracking
+
+| Job ID | Type | Task | Mode | Status | Duration | Results |
+|--------|------|------|------|---------|----------|---------|
+| 3445081 | dev test | hopper | pretrain | PENDING | 30min | - |
+
+## Configuration Notes
+
+### WandB Setup Required
+```bash
+export WANDB_API_KEY=<your_api_key>
+export WANDB_ENTITY=<your_username>
+```
+
+### Resource Requirements
+- **Dev jobs**: 30min, 24GB RAM, 8 CPUs, dev_accelerated
+- **Production**: 8h, 32GB RAM, 40 CPUs, accelerated
+
+## Issues Encountered
+
+None so far - installation completed without code modifications.
+
+## Next Steps
+
+1. Wait for dev test to complete
+2. Analyze dev test results
+3. Begin systematic pre-training experiments
+4. Document any issues or required fixes