Incremental behavior previously lacked one table-driven oracle covering every supported parser/LSP language family. That left exact-upsert and scoped-LSP fallback routing vulnerable to language-specific drift even when individual fixtures passed.
Add run_incremental_language_oracle_case in tests/test_pipeline.c. Each synthetic fixture performs a full fast index, edits source to add a callable symbol, runs incremental indexing, asserts the publication kind and fallback reason, and compares the resulting canonical graph with a fresh fast rebuild.
Cover Go, C, C++, CUDA, and Python exact publication plus JavaScript, TypeScript, TSX, PHP, C#, Java, Kotlin, and Rust scoped_lsp_gap full fallback. The helper releases pipelines, configuration, and project storage through one cleanup path; ordinary passes and failures remove fixtures, while CBM_TEST_ARTIFACT_DIR retains failed fixtures inside the runner-owned cache.
Verification: the ASan/UBSan test runner passed incremental_cross_lsp_language_matrix_matches_fresh_rebuild (13 cases) and eight adjacent exact, C-header fallback, Python/JavaScript scoped-LSP, delete, rename, overlay publish-failure, and overlay extraction-failure tests. git clang-format reported no changed-line edits and git diff --cached --check passed.
Signed-off-by: Andrew Hundt <ATHundt@gmail.com>
Andrew Hundt
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