Allow missing end-of-compression labels on history points

[alongd]

Summary

• allow version-1 volume-history RCM points to omit end-of-compression temperature and pressure labels
• retain supplied labels and emit null comparison labels when omitted
• document the conditional requirement and cover schema/comparison behavior

Verification

• Targeted coverage run: 592 passed (experimental-IDT, schema, and tests importing edited modules).
• Local full-suite exclusions reproduced on untouched official/main worktree /home/alon/Code/T3-i113-schema-ref at 1dae24c:
  • tests/test_functional.py::test_computing_thermo fails because RMG does not generate chem_annotated.yaml.
  • tests/test_utils/test_flux.py::test_generate_flux fails because Graphviz dot is absent from PATH.
  • Captured main-reproduction stdout/stderr: /home/alon/runs/i118-t3/main-{functional,flux}.{stdout,stderr}.log.

CI is the authority for the full suite.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.91%. Comparing base (35fc9d6) to head (18d6e77).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   81.92%   81.91%   -0.01%     
==========================================
  Files          78       78              
  Lines       12943    12947       +4     
  Branches     2731     2732       +1     
==========================================
+ Hits        10603    10605       +2     
- Misses       1694     1695       +1     
- Partials      646      647       +1     

Flag	Coverage Δ
unittests	81.91% <ø> (-0.01%)	⬇️

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[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation, tests, and documentation consistently preserve existing behavior while supporting omitted history-point labels.

Review effort: Balanced
Findings: None

What changed in this PR

Allows history-driven RCM experiments to omit compressed-state temperature and pressure labels while preserving existing history-free requirements.

Changes:

• Makes compressed-state labels conditionally optional.
• Emits None for omitted comparison labels.
• Adds tests and documentation for the updated schema.

File	Description
t3/​schema.py	Adds conditional label validation.
t3/​simulate/​cantera_idt.py	Handles omitted labels in comparison output.
tests/​test_simulate/​test_experimental_idt.py	Tests schema and simulation behavior.
docs/​input_reference.md	Documents conditional requirements.
docs/​examples.md	Clarifies RCM label semantics.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The implementation consistently updates validation, comparison output, documentation, and targeted tests without introducing unresolved issues.

Review effort: Balanced
Findings: None