Feature/jitter tool

[zamorofthat]

Summary

• Integrates the standalone jitter-tool as a gogen jitter subcommand
• Analyzes inter-arrival times to validate that gogen event timing looks realistic
• Useful for testing that generated data has natural variance, not metronomic patterns

Usage

Analyze intervals from stdin

cat intervals.txt | gogen jitter

Quiet mode (just PASS/FAIL)

gogen jitter -q < intervals.txt

JSON output

gogen jitter --json < intervals.txt

New jitter/ package with analysis logic and tests
New jitter CLI command in main.go

[coveralls]

coverage: 71.352%. first build
when pulling b58744a on feature/jitter-tool
into 1f35225 on dev.