Enhance cmd command with timeout, version-regex, and semver range support

[vertti]

Summary

• Add --timeout flag for version command timeout (default 30s)
• Add --version-regex flag to extract versions from messy command output using regex capture groups
• Add --range flag for semver constraint validation (e.g., >=1.0, <2.0, ^1.5, ~1.5)

Based on patterns from flaghunt.md research analyzing Goss, InSpec, Testinfra, and other infrastructure testing tools.

New Flags

Flag	Description
--timeout <duration>	Timeout for version command (default: 30s)
--version-regex <pattern>	Regex with capture group to extract version
--range <constraint>	Semver constraint (e.g., >=1.0, <2.0, ^1.5)

Examples

# Timeout for slow commands
preflight cmd slow-binary --timeout 60s

# Extract version from messy output
preflight cmd myapp --version-regex "version[:\s]+(\d+\.\d+\.\d+)" --min 2.0

# Semver range constraints
preflight cmd terraform --range ">=1.0, <2.0"
preflight cmd node --range "^18.0.0"

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.63%. Comparing base (e7c083d) to head (dc7dc40).
⚠️ Report is 52 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cmdcheck/check.go	88.37%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   89.71%   89.63%   -0.09%     
==========================================
  Files          30       30              
  Lines        1021     1061      +40     
==========================================
+ Hits          916      951      +35     
- Misses         73       76       +3     
- Partials       32       34       +2     

Files with missing lines	Coverage Δ
pkg/cmdcheck/runner.go	100.00% <100.00%> (ø)
pkg/cmdcheck/check.go	95.14% <88.37%> (-4.86%)	⬇️

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