PowerCumul v0.03

English

Continuous streaming sampling: powermetrics now runs as a long-lived process, parsing every sample block — 100% time coverage, zero extrapolation error. The old approach (spawn every 5s, measure 1s, extrapolate) is gone, along with its ~17k process spawns/day overhead.
DRAM counted: idle power no longer drops to 0 — DRAM draw is added to the Combined total.
Sleep gap fix: gaps over 90s (sleep/outage) are no longer charged at full power.
Throttled disk writes: state/raw files flush every 5s instead of per-sample.
Cost now cumulative: daily cost at idle is literally fractions of a cent (Mac mini idles at 2–6W), so the panel and status bar now show cumulative cost with 3 decimals — a number that actually moves.

连续流式采样：powermetrics 改为常驻进程逐块解析，100% 时间覆盖、零外推误差。旧方案（每 5s 启动一次、测 1 秒外推 5 秒）及其每天 1.7 万次进程创建开销一并移除。
计入 DRAM：空闲时功率不再整段记 0，内存耗电补进总量。
修复睡眠缺口：超过 90 秒的缺口（睡眠/中断）不再按满功率记账。
落盘节流：状态与原始流每 5 秒写一次，不再逐样本写盘。
费用改显示累计：Mac mini 空闲日电费只有几分钱（2 位小数恒为 0.00），面板与状态栏改为累计电费 + 3 位小数，数字真正看得见增长。