tests/test_pipeline.c lacked persisted CALLS coverage for a Python entry point importing PyO3 functions and lacked incremental-versus-fresh oracles for mixed Python/Rust and Rust/TypeScript/JavaScript repositories.
Add pipeline_python_pyo3_import_resolves_rust_function_calls plus two mixed-language incremental tests. The tests require Python edits to publish as CBM_PIPELINE_PUBLISH_INCREMENTAL_EXACT, require Rust and TypeScript scoped-LSP gaps to publish a full rebuild with reason scoped_lsp_gap, and compare each resulting graph with a fresh fast rebuild.
Route setup_lang_repo and setup_incremental_repo through cbm_resolve_cache_dir, reject truncated paths, and remove partially created fixture trees on setup errors. Assertion-aborted fixtures now remain inside the test runner cache lifecycle and are retained only through CBM_TEST_ARTIFACT_DIR.
Verification: all three focused tests passed with the ASan/UBSan runner and the current-source TSan runner. Apple leaks reported 0 leaks for 0 total leaked bytes for each focused test. A real MCP 2025-11-25 trace_path request against a mixed Python/Rust repository returned cli_main -> _run_cli_command and cli_main -> serve_mcp with isError=false and clean EOF shutdown.
Signed-off-by: Andrew Hundt <ATHundt@gmail.com>
Andrew Hundt
ef5f2e3009