docs: explain first-iteration training skip

[njzjz-bot]

Summary

• document how init_models_paths skips redundant iteration-zero training
• clarify that the supplied committee models flow directly into exploration until new labels exist
• assert the skip path never invokes a DeePMD training or freeze command

Tests

• PYTHONPATH=tests python -m unittest -v tests.op.test_run_dp_train.TestRunDPTrainNullIterData.test_exec_v2_empty_list
• ruff format --check dpgen2/entrypoint/args.py
• isort --check-only on changed Python files
• python -m py_compile tests/op/test_run_dp_train.py
• git diff --check

Closes #73

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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📥 Commits

Reviewing files that changed from the base of the PR and between 6b01f29 and 2a95f27.

📒 Files selected for processing (3)

• docs/input.md
• dpgen2/entrypoint/args.py
• tests/op/test_run_dp_train.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.43%. Comparing base (6b01f29) to head (2a95f27).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #394   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         104      104           
  Lines        6110     6110           
=======================================
  Hits         5159     5159           
  Misses        951      951           

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