Support python -m dargs from source checkouts

[njzjz-bot]

Summary

• fall back to an optional setuptools-scm lookup when the generated _version module is absent
• load the optional SCM helper dynamically so runtime and type-check environments do not require it
• degrade to 0+unknown when source metadata tooling is unavailable

Fixes #116.

Validation

• Focused source-checkout CLI unittests
• python -m dargs --version
• Ruff checks on changed files

AI attribution

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

[coderabbitai]

Important

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This repository does not receive automatic reviews because it has fewer than 10 stars.

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 99879afb-fec0-4139-84e1-150304977666

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.10%. Comparing base (66c7d8b) to head (99a8c94).

Files with missing lines	Patch %	Lines
dargs/cli.py	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   75.14%   74.10%   -1.05%     
==========================================
  Files           9        9              
  Lines         853      865      +12     
==========================================
  Hits          641      641              
- Misses        212      224      +12     

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[njzjz-bot]

Review result: no blocking issues found.

The version fallback handles raw VCS checkouts, Git archives, and environments without setuptools_scm, while avoiding suppression of unrelated transitive import failures. Focused source-checkout and fallback probes passed, and CI is green.

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