Distill Trigger + Entry Shape

Default off. Explicit user ask always wins. Auto-suggest only on signal: major rework, >=2 blueprint revisions, recurring issue class, novel working trick, repeated user correction. Skip when tasks <5 unless asked.

Entry (for the user's own experience store, confirm before filing): ID / category / trigger-condition / problem / solution / anti-pattern / reusable-fragment / confidence. Polish answers "what happened here"; Distill answers "what transfers elsewhere". Never two retro essays.