fix(tests): replace #[test] with #[tokio::test] on 13 async fns Refs #2040

[AlexMikhalev]

Problem

13 async test functions in crates/terraphim_rolegraph/src/lib.rs were decorated with #[test] instead of #[tokio::test]. These tests compiled and appeared to pass but never executed their async bodies -- the test runner received a Future, dropped it without polling, and recorded a pass since no panic occurred.

Fix

Replace #[test] with #[tokio::test] on all 13 affected functions: test_split_paragraphs, test_find_matching_node_idss, test_find_matching_node_idss_ac_values, test_terraphim_engineer, test_rolegraph, test_is_all_terms_connected_by_path_true, test_is_all_terms_connected_by_path_false, tfidf_empty_index_returns_empty, tfidf_exact_match_scores_high, tfidf_no_match_scores_zero, tfidf_partial_match, tfidf_threshold_filters, two_pass_aho_corasick_first.

Verification

• cargo test -p terraphim_rolegraph: 20 passed, 1 deliberately #[ignore]d
• Execution time 2.21s (was ~0ms) confirming async bodies now execute
• cargo clippy -p terraphim_rolegraph -- -D warnings: clean
• cargo fmt -p terraphim_rolegraph -- --check: clean

Note on count

Issue listed 12 functions; inspection found 13 (the #2037 commit added test_is_all_terms_connected_by_path_true which also had #[test] before async fn). All 13 are fixed.

Refs terraphim/terraphim-ai#2040 (Gitea)

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