feat(eq): Phase L-6 4-layer tests

[k-yoshimi]

Summary

• Layer 1 equivalence: eq_iter01 / eq_tst2 fixtures (SCALARS/ARRAYS/STRINGS/UNREGISTERED_KEYS/BASELINE_NAME/MODE) replayed vs L-0 baselines via compare_metrics.py at tol 1e-10, gated on libeqapi.so via _ffi._candidate_paths() and on EQ_RUN_OK=1 (L-5 EqState schema overlap with L-0 baseline schema is L-7+ follow-up).
• Layer 2 C ABI: new eq/tests/c_abi/test_negative.c covers pre-init / unknown name / malformed PSIB[abc] / bare PSIB rejection / double-finalize / post-finalize lockout / re-init.
• Layer 4 sweep: 3x3 RR x BB grid, mode=1, fresh Eq() context per sample (mirrors trlib PR feat(trlib): plot API + TOML config runner (reference) #83 re-init-per-sample fix); asserts nrgmax/nzgmax/npsmax invariance.
• eq/Makefile: new eq_api_check_all target bundling existing eq_api_check (smoke + param dispatch) + eq_api_check_so (run_so) + new test_negative; clean / clean_pic updated.
• test_run/test_definitions.conf: appends 5 eqlib_* rows (c_abi, wrapper, ffi, equivalence, sweep) after the wrxlib_* block.

Test plan

• python3 -m unittest discover python/eqlib/tests -v -> 31 tests, pass-or-skip clean (skipped tests gated on libeqapi.so / EQ_RUN_OK)
• gcc -Wall -Wextra -I.. -c eq/tests/c_abi/test_negative.c -> clean (no warnings)
• bash -n test_run/run_tests.sh -> exit 0
• ./test_run/run_tests.sh -l | grep eqlib_ -> 5 rows
• make -n -C eq eq_api_check_all -> dry-run shows smoke + run_so + negative invocations
• Full integration ./run_tests.sh eqlib_* after merging (requires PIC build + EQ_RUN_OK schema fix)

Constraints honored

• No edits to eq/ Fortran sources or python/eqlib/ core wrapper code (only test additions).
• Mirrors tr / fp / wrx L-6 patterns exactly.

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Generated with Claude Code

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Note

Low Risk
Low risk: changes are limited to new test drivers/fixtures and Makefile targets, with no modifications to EQ runtime/Fortran sources. Main risk is CI/build breakage from the new eq_api_check_all target and added test definitions.

Overview
Adds Phase L-6 test coverage for the EQ C ABI and Python wrapper.

The EQ Makefile now builds a new test_negative C driver and exposes eq_api_check_all to run the full C ABI suite (smoke + dlopen run + negative lifecycle/validation checks), and clean targets remove the new artifacts. Python adds fixture modules for eq_iter01/eq_tst2, an opt-in Layer 1 equivalence test (gated on libeqapi.so and EQ_RUN_OK=1), and a Layer 4 3x3 (RR, BB) sweep smoke test to detect state leakage.

test_run/test_definitions.conf registers five new eqlib_* entries so the central test runner can invoke the EQ library C ABI, wrapper, FFI, equivalence, and sweep tests.

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[k-yoshimi]

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