release 0.3.0

0.2.0 — sparklines, memory panel, tests/CI, macOS 27 fixes

- rolling history sparklines (CPU, GPU, ANE, package power, RAM)
- memory panel; s toggles process sort cpu/mem; --version flag
- fix: energy-key (mJ) samples converted to mW via sample window
- fix: GPU freq units on macOS 27; cluster avg from per-core mean
- fix: dead stream surfaced in UI; per-second sudo probe removed
- fix: process table diffs in place, cursor follows PID
- ANE ceiling self-calibrates; passwordless via NOPASSWD sudoers rule
- pytest suite (25) with real M3 Max/macOS 27 fixture; ruff+mypy+CI

sync homebrew formula scaffold with shipped 0.1.0