Validate complete blocks in block_avg

[njzjz-bot]

Summary:

• reject nonpositive block sizes and inputs with no complete post-skip block
• build block statistics only from complete chunks
• add partial-only and empty-input regression tests

Tests:

• PYTHONPATH=.. python -m unittest test_lib_utils.TestBlockAvg -v
• python -m ruff check --select I,F --ignore F841 dpti/lib/utils.py tests/test_lib_utils.py

Fixes #143

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

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Run ID: 52a17af6-3559-458f-824d-0ac6fd5b44ca

📥 Commits

Reviewing files that changed from the base of the PR and between 78091bd and f9bfd41.

📒 Files selected for processing (2)

• dpti/lib/utils.py
• tests/test_lib_utils.py

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (78091bd) to head (f9bfd41).

Files with missing lines	Patch %	Lines
dpti/lib/utils.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           devel    #167   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         25      25           
  Lines       6665    6666    +1     
=====================================
- Misses      6665    6666    +1     

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