fix: make training examples self-contained

[njzjz-bot]

Summary

• add a shared repository DPA-2 training template under examples/
• update every previously missing train.json reference to resolve to that template
• validate that each tested example references existing, valid JSON templates

Tests

• PYTHONPATH=tests python -m unittest -v tests.test_check_examples
• repository-wide script verifying every example template_script path resolves
• ruff format --check tests/test_check_examples.py
• isort --check-only tests/test_check_examples.py
• python -m json.tool examples/train.json
• git diff --check

Closes #360

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 d32656e.

📒 Files selected for processing (11)

• examples/calypso/input.test.json
• examples/ch4/input_dist.json
• examples/diffcsp/dpgen.json
• examples/train.json
• examples/water/input_distill.json
• examples/water/input_dpgen.json
• examples/water/input_dpgen_abacus.json
• examples/water/input_dpgen_cp2k.json
• examples/water/input_dpgen_slurm.json
• examples/water/input_multitask.json
• tests/test_check_examples.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 (d32656e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #386   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         104      104           
  Lines        6110     6110           
=======================================
  Hits         5159     5159           
  Misses        951      951           

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