merge: 合併 origin/main（M0 cockpit 改名）並整合 companion

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

plugins/cockpit/hooks/companion/affinity.ts

@@ -0,0 +1,49 @@
+import { clamp } from './mood'
+import type { Affinity } from './types'
+
+const DAY = 86_400_000
+
+export const GAIN = 0.01
+export const DAILY_CAP = 0.05
+export const LOSS = 0.03
+const IDLE_GRACE_DAYS = 7
+const IDLE_HALF_LIFE_DAYS = 30
+
+// 升階門檻；降階門檻 = 升階門檻 − 0.05，形成遲滯
+export const UP = [0.3, 0.55, 0.8]
+export const HYSTERESIS = 0.05
+
+export const dayKey = (ms: number) => new Date(ms).toISOString().slice(0, 10)
+
+export const initialAffinity = (now: number): Affinity => ({ value: 0, stage: 0, dayKey: dayKey(now), dayGain: 0, lastSeen: now })
+
+export function stageFor(value: number, current: number): number {
+  let s = current
+  while (s < UP.length && value >= UP[s]!) s++
+  while (s > 0 && value < UP[s - 1]! - HYSTERESIS) s--
+  return s
+}
+
+// 離開超過 7 天後，以 30 天半衰期回到 0
+export function idleDecay(a: Affinity, now: number): Affinity {
+  const idleDays = (now - a.lastSeen) / DAY
+  if (idleDays <= IDLE_GRACE_DAYS) return a
+  const value = a.value * Math.pow(0.5, (idleDays - IDLE_GRACE_DAYS) / IDLE_HALF_LIFE_DAYS)
+  return { ...a, value, stage: stageFor(value, a.stage) }
+}
+
+export function interact(prev: Affinity, kind: 'meaningful' | 'negative', now: number): Affinity {
+  let a = idleDecay(prev, now)
+  const key = dayKey(now)
+  if (a.dayKey !== key) a = { ...a, dayKey: key, dayGain: 0 }
+  let { value, dayGain } = a
+  if (kind === 'meaningful') {
+    const gain = Math.max(0, Math.min(GAIN, DAILY_CAP - dayGain))
+    value += gain
+    dayGain += gain
+  } else {
+    value -= LOSS
+  }
+  value = clamp(value)
+  return { value, dayGain, dayKey: key, lastSeen: now, stage: stageFor(value, a.stage) }
+}