storkit: create 416_refactor_split_io_fs_rs_into_submodules

.storkit/work/1_backlog/416_refactor_split_io_fs_rs_into_submodules.md

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+---
+name: "Split io/fs.rs into submodules"
+---
+
+# Refactor 416: Split io/fs.rs into submodules
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Refactor the monolithic server/src/io/fs.rs (2007 lines) into focused submodules within an fs/ directory.
+
+## Acceptance Criteria
+
+- [ ] scaffold.rs contains scaffold_story_kit, write_file_if_missing, write_script_if_missing, write_story_kit_gitignore, append_root_gitignore_entries, detect_components_toml, detect_script_test, generate_project_toml and their unit tests
+- [ ] project.rs contains open_project, close_project, get_current_project, get_known_projects, forget_known_project, ensure_project_root_with_story_kit, validate_project_path and their unit tests
+- [ ] files.rs contains read_file, write_file, list_directory, list_project_files, FileEntry, create_directory_absolute and their unit tests
+- [ ] paths.rs contains resolve_cli_path, resolve_path, resolve_path_impl, find_story_kit_root, get_home_directory and their unit tests
+- [ ] preferences.rs contains get_model_preference, set_model_preference and their unit tests
+- [ ] mod.rs re-exports all public types and functions
+- [ ] Unit tests live in their respective module files
+- [ ] No public API changes — all existing imports continue to work
+
+## Out of Scope
+
+- TBD