Make the Airflow example portable

[njzjz-bot]

Summary:

• resolve the Airflow example input and work directory from the checkout
• document the TI_taskflow DAG requirement and allow DAG/work directory overrides
• remove the developer-specific home path and add command-construction coverage

Tests:

• PYTHONPATH=.. python -m unittest test_airflow_example -v
• bash -n examples/airflow.sh
• python -m ruff check --select I,F --ignore F841 tests/test_airflow_example.py

Fixes #148

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 78091bd and 9be6679.

📒 Files selected for processing (4)

• README.md
• examples/FreeEnergy.json
• examples/airflow.sh
• tests/test_airflow_example.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (78091bd) to head (9be6679).

Additional details and impacted files

@@          Coverage Diff          @@
##           devel    #170   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         25      25           
  Lines       6665    6665           
=====================================
  Misses      6665    6665           

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