story-kit: create 125_story_test_coverage_http_io_rs

.story_kit/work/1_upcoming/125_story_test_coverage_http_io_rs.md

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+---
+name: "Add test coverage for http/io.rs (0% -> 60%+)"
+---
+
+# Story 125: Add test coverage for http/io.rs
+
+Currently at 0% line coverage (76 lines). These are the IO-related HTTP endpoints (absolute path listing, directory creation, home directory).
+
+## What to test
+
+- `list_directory_absolute` endpoint — valid path, invalid path, permission errors
+- `create_directory_absolute` endpoint — new dir, existing dir, nested creation
+- `get_home_directory` endpoint — returns correct home path
+- Error responses for invalid inputs
+
+## Notes
+
+- Use temp directories for filesystem tests
+- These are straightforward CRUD-style endpoints, should be quick to cover
+- Follow the test patterns used in `http/project.rs` and `http/settings.rs`
+
+## Acceptance Criteria
+
+- [ ] Line coverage for `http/io.rs` reaches 60%+
+- [ ] Tests pass with `cargo test`
+- [ ] `cargo clippy` clean