storkit: create 373_bug_scaffold_gitignore_missing_transient_pipeline_stage_directories

.storkit/work/1_backlog/373_bug_scaffold_gitignore_missing_transient_pipeline_stage_directories.md

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+---
+name: "Scaffold gitignore missing transient pipeline stage directories"
+---
+
+# Bug 373: Scaffold gitignore missing transient pipeline stage directories
+
+## Description
+
+The `write_story_kit_gitignore` function in `server/src/io/fs.rs` does not include the transient pipeline stages (`work/2_current/`, `work/3_qa/`, `work/4_merge/`) in the `.storkit/.gitignore` entries list. These stages are not committed to git (only `1_backlog`, `5_done`, and `6_archived` are commit-worthy per spike 92), so they should be ignored for new projects.
+
+## How to Reproduce
+
+1. Scaffold a new project with storkit
+2. Check `.storkit/.gitignore`
+
+## Actual Result
+
+`.storkit/.gitignore` only contains `bot.toml`, `matrix_store/`, `matrix_device_id`, `worktrees/`, `merge_workspace/`, `coverage/`. The transient pipeline directories are missing.
+
+## Expected Result
+
+`.storkit/.gitignore` also includes `work/2_current/`, `work/3_qa/`, `work/4_merge/`.
+
+## Acceptance Criteria
+
+- [ ] Scaffold writes work/2_current/, work/3_qa/, work/4_merge/ to .storkit/.gitignore
+- [ ] Idempotent — running scaffold again does not duplicate entries
+- [ ] Existing .storkit/.gitignore files get the new entries appended on next scaffold run