Task 9 — title-similarity clustering in news-core + ClusterRepo in news-store
Workspace: /home/connor/docs/projects/news
Date: 2026-09-01

Files created/modified:
- crates/news-core/src/clustering.rs (new)
- crates/news-core/src/lib.rs (+ pub mod clustering;)
- crates/news-store/src/clusters.rs (new)
- crates/news-store/src/lib.rs (+ pub mod clusters; + re-export ClusterRepo)

================================================================================
$ cargo test -p news-core
================================================================================
...
running 18 tests
test clustering::tests::identical_titles_have_similarity_one ... ok
test clustering::tests::disjoint_titles_have_similarity_zero ... ok
test clustering::tests::stopword_difference_keeps_syndication_titles_high ... ok
test clustering::tests::should_cluster_respects_threshold ... ok
...
test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

   Doc-tests news_core

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

================================================================================
$ cargo test -p news-store
================================================================================
...
running 13 tests
test clusters::tests::source_count_is_distinct_sources_not_item_count ... ok
test clusters::tests::item_outside_45_minute_window_starts_new_cluster ... ok
test clusters::tests::same_source_repeats_create_one_cluster_with_both_members ... ok
...
test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s

   Doc-tests news_store

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

================================================================================
$ cargo fmt --all --check
================================================================================
(no output)

exit status: 0

================================================================================
$ cargo clippy --workspace --all-targets -- -D warnings
================================================================================
...
    Checking news-core v0.1.0
    Checking news-server v0.1.0
    Checking news-ingest v0.1.0
    Checking news-web v0.1.0
    Checking news-store v0.1.0
    Checking news-cli v0.1.0
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.46s

exit status: 0