changelog-observerlisted

# Changelog Observer Track session context in `.changelog/session-YYYY-MM-DD.md`. ## Log target - Use `.changelog/session-YYYY-MM-DD.md` for the current local date. - Create `.changelog/` and the session file if they do not exist. - If the session file is new, initialize it from [template.md](template.md). - Append new entries in chronological order. ## What to log - `file-change`: after creating, editing, or deleting project files. - `test-result`: after running tests, checks, or validation commands. - `decision`: after making an implementation or architecture decision worth preserving. ## Entry rules - Keep each description short and specific. - List only directly affected files. - Use `none` when no files were changed. - Do not rewrite earlier entries unless they are incorrect. ## Template Use the markdown structure in [template.md](template.md) for each appended entry.