retrospective

## Phase 1: Parse Arguments Determine whether this is a sprint retrospective (`sprint-N`) or a milestone retrospective (`milestone-name`). --- ## Phase 1b: Check for Existing Retrospective Before loading any data, glob for an existing retrospective file: - For sprint retrospectives: `production/retrospectives/retro-[sprint-slug]-*.md` (also check `production/sprints/sprint-[N]-retrospective.md` as an alternate location) - For milestone retrospectives: `production/retrospectives/retro-[milestone-name]-*.md` If a matching file is found, present the user with: ``` An existing retrospective was found: [filename] [A] Update existing retrospective — load it and add/revise sections [B] Start fresh — generate a new retrospective, archiving the old one ``` Wait for user selection before continuing. If updating, read the existing file and carry its content forward into the generation phase, revising sections with new data. --- ## Phase 2: Load Sprint or Milestone Data Read the sprint or milestone plan from the appropriate location: - Sprint plans: `production/sprints/` - Milestone definitions: `production/milestones/` **If the file does not exist or is empty**, output: > "No sprint data found for [sprint/milestone]. Run `/sprint-status` to generate > sprint data first, or provide the sprint details manually." Then use `AskUserQuestion` to present two options: - **[A] Provide data manually** — ask the user to paste or describe the sprint tasks, dates, and outcomes; ...