Adds a public IAC IJCAI 2026 competition starter kit for submission packages.

[khvedant02]

Adds a public AssetOpsBench competition starter kit for submission packages.

Changes:

• Adds public scenario loading with safeguards against ground-truth fields.
• Adds submission generation and zip packaging.
• Adds phase 1 / phase 2 metadata configs.
• Adds a minimal baseline predictor and public-safe example scenario.
• Documents the participant flow and final phase 2 workflow.
• Adds focused tests for dataset sanitization and package generation.

Validation:

• UV_CACHE_DIR=.uv-cache uv run pytest competition/tests/test_competition_starter.py
• python3 competition/run.py --config competition/metadata_config_phase1.json --output-dir /private/tmp/assetops_comp_results_push --subset-size 1

[DhavalRepo18]

This PR is for the IJCAI competition and is not intended to bring on the main branch. It will be maintained here.