Release 0.4.0

[imedboumalek]

Summary

First stable release. Everything since 0.2.0-dev.4 (the 0.3.0-dev previews were never published):

• Analyzer sharpness curves (iOS): time-varying brightness tracking as HapticSharpnessControl deviations
• Android primitive compositions (toPrimitives, --formats primitives) and AHAP parsing (fromAhap, .ahap CLI inputs)
• Accuracy fixes: AHAP curve-relative control point times, duration-scaled curve budgets (--curve-rate), midpoint waveform sampling
• Docs: tuning guide (symptom → knob), haptics/sound learning resources, rewritten guided example
• CI fixed (package job scoped; dedicated Flutter demo-app job) and new branch strategy: feat/* → dev (auto dev prereleases) → main (stable tags)
• Roadmap: playback removed; version graduated to stable 0.4.0

Release steps after merge

Tag v0.4.0 on main — the tag-triggered workflow publishes to pub.dev via OIDC.

Test plan

• CI green on dev (package matrix + Flutter demo app)
• 144 package tests, 3 app tests
• dart pub publish --dry-run validates as 0.4.0
• Dev-prerelease workflow verified live: correctly skips stable versions