story-kit: queue 120_story_test_coverage_llm_chat_rs for merge

.story_kit/work/2_current/125_story_test_coverage_http_io_rs.md

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-name: "Add test coverage for http/io.rs (0% -> 60%+)"
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-
-# 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