BuildTimer v0.1.0

BuildTimer v0.1.0 — initial public release.

• Measure any command with buildtimer -- [args...]
• Compare duration with the previous matching run
• Local history with buildtimer history and buildtimer clear
• Direct process execution without shell interpolation
• Preserves wrapped command exit codes
• Redacts common secrets before storing command history
• Local-only: no telemetry, cloud, server, or account system
• Linux-first

Validated on a real Linux machine. CI fmt, Clippy -D warnings, unit tests, and integration tests pass.