chore(coverage): declare the gate in [tool.coverage.report] and measure only in test-ci

[lesnik512]

Summary

Converges the coverage gate on the modern-python standard, section 5: the 100 % gate is declared once as [tool.coverage.report] fail_under = 100, and coverage is measured only by just test-ci (and test-branch), never on every run through pytest addopts.

pytest-cov reads fail_under from the coverage config when no --cov-fail-under flag is given and applies it whenever coverage is measured, so the gate fires in test-ci exactly as before and a targeted just test run stays gate-free. coverage special-cases 100: the total must really be 100, no rounding.

Changes

• pyproject.toml: fail_under = 100 under [tool.coverage.report]; any --cov* flags removed from addopts.
• justfile: test-ci measures coverage and writes the XML report without the flag; test-branch likewise. Where test-ci did not exist it is added, and CI now calls it.
• .github/workflows/_checks.yml (where present): the pytest step runs just test-ci.

Checklist

• Lint and format pass (ruff) — config and recipes only
• Type check passes (ty) — no Python changed
• Tests pass and new behavior is covered — CI runs just test-ci, which is the gate
• Build succeeds — no packaging change
• Repo metadata stays consistent across the three surfaces — untouched

[github-actions]

Benchmark

Details

Benchmark suite	Current: 6d16514	Previous: fc39046	Ratio
benchmarks/test_guard_by_type.py::test_g16_resolve_by_type	4393389.3549111495 iter/sec (stddev: 7.208148275236166e-9)	4158761.035219325 iter/sec (stddev: 8.13670554091459e-9)	0.95
benchmarks/test_guard_by_type.py::test_g17_resolve_by_type_large_registry	4376741.5054409 iter/sec (stddev: 6.725767775502434e-9)	3990230.9569556788 iter/sec (stddev: 1.8798908569888113e-8)	0.91
benchmarks/test_guard_cold.py::test_g8_cold_first_resolve	17610.558221663625 iter/sec (stddev: 0.00005830058347627865)	16134.580325706667 iter/sec (stddev: 0.00005046863507128928)	0.92
benchmarks/test_guard_cold.py::test_g8b_cold_first_resolve_cached	15173.48557662349 iter/sec (stddev: 0.0001371587716083082)	13596.70743422707 iter/sec (stddev: 0.00010726566353146992)	0.90
benchmarks/test_guard_concurrency.py::test_g14_concurrent_cached_hit[1]	542.1437994469555 iter/sec (stddev: 0.00005345765010909475)	553.6127861863322 iter/sec (stddev: 0.0001579069634057032)	1.02
benchmarks/test_guard_concurrency.py::test_g14_concurrent_cached_hit[2]	504.5277088722932 iter/sec (stddev: 0.0000969406286914811)	488.3466119845556 iter/sec (stddev: 0.00022730325681841844)	0.97
benchmarks/test_guard_concurrency.py::test_g14_concurrent_cached_hit[4]	456.5763806732935 iter/sec (stddev: 0.00012315294701496608)	459.4334564016916 iter/sec (stddev: 0.000042940089461520866)	1.01
benchmarks/test_guard_concurrency.py::test_g15_concurrent_first_resolve[1]	1845.9943238434275 iter/sec (stddev: 0.00017457660449678652)	1668.6501354607235 iter/sec (stddev: 0.00018814109746920226)	0.90
benchmarks/test_guard_concurrency.py::test_g15_concurrent_first_resolve[2]	1478.4284355013854 iter/sec (stddev: 0.00019650832093564283)	1335.316842644818 iter/sec (stddev: 0.00020593009553087613)	0.90
benchmarks/test_guard_concurrency.py::test_g15_concurrent_first_resolve[4]	1049.7168375711706 iter/sec (stddev: 0.00019719311971386788)	873.4240364302943 iter/sec (stddev: 0.001255961381736033)	0.83
benchmarks/test_guard_lifecycle.py::test_g6_build_child_container	735514.8532260801 iter/sec (stddev: 5.009687619463809e-8)	714209.701967521 iter/sec (stddev: 4.7554942163995425e-8)	0.97
benchmarks/test_guard_lifecycle.py::test_g6b_build_child_container_auto_scope	669271.5720155721 iter/sec (stddev: 3.022329804797654e-8)	675600.7205147323 iter/sec (stddev: 8.590805162615815e-8)	1.01
benchmarks/test_guard_lifecycle.py::test_g7_request_lifecycle_batch	2402.2985751984 iter/sec (stddev: 0.000010474076167779656)	2436.353244730597 iter/sec (stddev: 0.000012183633779711561)	1.01
benchmarks/test_guard_lifecycle.py::test_g7c_event_loop_floor_control	60860.29831257309 iter/sec (stddev: 0.0000014105855205846606)	61846.76391935982 iter/sec (stddev: 0.000001956842012191336)	1.02
benchmarks/test_guard_lifecycle.py::test_g13_teardown_at_scale	48317.92163762849 iter/sec (stddev: 0.0000014926168337825658)	49238.06084820303 iter/sec (stddev: 0.0000020274507454879575)	1.02
benchmarks/test_guard_resolve.py::test_g1_transient_resolve	2466121.5017310646 iter/sec (stddev: 2.4264223464552454e-8)	2494957.37926869 iter/sec (stddev: 2.0738593852462502e-8)	1.01
benchmarks/test_guard_resolve.py::test_g2_cached_resolve	4203052.315448951 iter/sec (stddev: 6.323446569615443e-9)	4192646.2242921055 iter/sec (stddev: 9.242397551818976e-9)	1.00
benchmarks/test_guard_resolve.py::test_g3_deep_chain	850536.1354532214 iter/sec (stddev: 7.219176847087456e-8)	855739.9204431148 iter/sec (stddev: 4.426302771736765e-8)	1.01
benchmarks/test_guard_resolve.py::test_g4_wide_resolve	497678.4668136146 iter/sec (stddev: 3.2662562994842574e-7)	499545.67569668434 iter/sec (stddev: 3.134731071349648e-7)	1.00
benchmarks/test_guard_resolve.py::test_g5_cross_scope	1971031.5521708794 iter/sec (stddev: 2.453177552541404e-8)	1872950.2023283816 iter/sec (stddev: 2.681412062947349e-8)	0.95
benchmarks/test_guard_resolve.py::test_g9_context_resolve	1150528.6046161628 iter/sec (stddev: 1.5682005208967376e-7)	1114981.832487813 iter/sec (stddev: 1.2174079470885297e-7)	0.97
benchmarks/test_guard_resolve.py::test_g12_override_active_resolve	850807.2118489445 iter/sec (stddev: 1.227639266438015e-7)	848681.8867003281 iter/sec (stddev: 1.014716189211694e-7)	1.00
benchmarks/test_guard_resolve.py::test_g18_alias_hop	2975464.321210177 iter/sec (stddev: 7.43441438892879e-9)	2819884.449033468 iter/sec (stddev: 1.3953969227339099e-8)	0.95
benchmarks/test_guard_validate.py::test_g10_validate_deep_chain	24304.657324014453 iter/sec (stddev: 0.0002552970084586549)	24589.945648246317 iter/sec (stddev: 0.000023738884466710817)	1.01
benchmarks/test_guard_validate.py::test_g11_validate_wide	16396.02056119977 iter/sec (stddev: 0.000026101556284796933)	15316.434942105047 iter/sec (stddev: 0.000024992133312082236)	0.93

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