trail

Append-only, attributed project memory for a code repository, stored as Markdown in `.trail/` and written only through the `trail` CLI (atomic, provenance-stamped, append-only). Tracks tasks with a timeline, lightweight ADR-style decisions, research notes, and a daily log, plus a regenerated `_hot.md` cache. Use when the repo has a `.trail/` directory, or when the user wants to start project memory in a code repo. Triggers include the word "trail"; starting or resuming a task, feature, or refactor; recording progress; making a technical decision or ADR (stack, schema, infra, library, API contract); doing non-trivial research; and questions like "what did we do with X", "where did X land", or "what did we decide about X". Activate proactively, without asking, when a non-trivial task, decision, or research begins. For notes with no associated repo (personal/global scratch), use the obsidian-memory skill instead.