fix: make _DependencyChainError._message abstract for ty 0.0.87

[lesnik512]

Fixes #676.

The scheduled dependency check picked up ty 0.0.87, which turns on invalid-mutable-override by default. It reports three errors on main.

• _DependencyChainError declared _message as a writable Callable attribute, and both subclasses override it with a method. The base now declares it as an abstract method, which is what it always was. Coverage stays at 100%.
• The __module__ = "..." assignment in test_compile_resolver_rejects_an_unknown_provider_type is flagged because the base class has __slots__. That's a ty regression: 0.0.86 accepts the same code, and a class without __slots__ in its bases passes on 0.0.87. It gets a per-line ignore. The existing comment moved to the line above so the line stays under 120 characters.

Locally with ty 0.0.87, just lint-ci is clean and just test-ci passes (1016 passed, 100% coverage).

[github-actions]

Benchmark

Details

Benchmark suite	Current: 3fe6c9d	Previous: 0562ccb	Ratio
benchmarks/test_guard_by_type.py::test_g16_resolve_by_type	3357858.798211087 iter/sec (stddev: 1.1168485846607077e-8)	3665033.527713848 iter/sec (stddev: 3.2569022629891716e-8)	1.09
benchmarks/test_guard_by_type.py::test_g17_resolve_by_type_large_registry	3310330.618270282 iter/sec (stddev: 1.0448271808510978e-8)	3770267.07063078 iter/sec (stddev: 1.486217850095513e-8)	1.14
benchmarks/test_guard_cold.py::test_g8_cold_first_resolve	21989.312002244285 iter/sec (stddev: 0.000045064164579378785)	22122.491274704902 iter/sec (stddev: 0.000046285293255025835)	1.01
benchmarks/test_guard_cold.py::test_g8b_cold_first_resolve_cached	17528.34082561955 iter/sec (stddev: 0.00012272756653031826)	17141.423125218098 iter/sec (stddev: 0.00012621412593876789)	0.98
benchmarks/test_guard_concurrency.py::test_g14_concurrent_cached_hit[1]	452.79242464589294 iter/sec (stddev: 0.00007455318000854812)	405.53114584126445 iter/sec (stddev: 0.0000683064678782271)	0.90
benchmarks/test_guard_concurrency.py::test_g14_concurrent_cached_hit[2]	452.6459860087511 iter/sec (stddev: 0.00006347065420245676)	370.6104969741538 iter/sec (stddev: 0.0000722813039338876)	0.82
benchmarks/test_guard_concurrency.py::test_g14_concurrent_cached_hit[4]	442.02381559862334 iter/sec (stddev: 0.00005570549244987515)	386.32799278074316 iter/sec (stddev: 0.00009036164068038687)	0.87
benchmarks/test_guard_concurrency.py::test_g15_concurrent_first_resolve[1]	13021.288287203814 iter/sec (stddev: 0.0000073439971975834196)	13809.07753525987 iter/sec (stddev: 0.000007226556315135442)	1.06
benchmarks/test_guard_concurrency.py::test_g15_concurrent_first_resolve[2]	6562.294825764092 iter/sec (stddev: 0.000014788848432166258)	6379.784419617411 iter/sec (stddev: 0.000023441629222146088)	0.97
benchmarks/test_guard_concurrency.py::test_g15_concurrent_first_resolve[4]	3320.602328488134 iter/sec (stddev: 0.00004248146952018593)	3074.107745990331 iter/sec (stddev: 0.00012940936256357954)	0.93
benchmarks/test_guard_concurrency.py::test_g15b_concurrent_first_resolve_sibling_children[1]	9450.92637981244 iter/sec (stddev: 0.000009735924875094773)	7752.923126611682 iter/sec (stddev: 0.000029032841718486824)	0.82
benchmarks/test_guard_concurrency.py::test_g15b_concurrent_first_resolve_sibling_children[2]	4054.5589562303135 iter/sec (stddev: 0.000019151504485415926)	3779.4268536960594 iter/sec (stddev: 0.00002767991532369385)	0.93
benchmarks/test_guard_concurrency.py::test_g15b_concurrent_first_resolve_sibling_children[4]	1870.670275190263 iter/sec (stddev: 0.000044130807470296084)	1728.5221436703077 iter/sec (stddev: 0.00004966410864454639)	0.92
benchmarks/test_guard_concurrency.py::test_g15c_worker_pool_floor_control[1]	39797.33868531325 iter/sec (stddev: 0.000005008209676770247)	35508.547499431355 iter/sec (stddev: 0.000005089717544758893)	0.89
benchmarks/test_guard_concurrency.py::test_g15c_worker_pool_floor_control[2]	15326.161796469225 iter/sec (stddev: 0.000011616911344868735)	12648.965282948015 iter/sec (stddev: 0.00001476460567443953)	0.83
benchmarks/test_guard_concurrency.py::test_g15c_worker_pool_floor_control[4]	5590.746196902847 iter/sec (stddev: 0.000034909874716726894)	6085.090559615503 iter/sec (stddev: 0.000036673124683470755)	1.09
benchmarks/test_guard_lifecycle.py::test_g6_build_child_container	1586770.585858911 iter/sec (stddev: 2.876698871252247e-8)	1572460.8639048617 iter/sec (stddev: 4.3238586831361774e-8)	0.99
benchmarks/test_guard_lifecycle.py::test_g6b_build_child_container_auto_scope	1691301.8165708429 iter/sec (stddev: 1.7569033183411853e-8)	1647764.405930359 iter/sec (stddev: 3.229029361516006e-8)	0.97
benchmarks/test_guard_lifecycle.py::test_g7_request_lifecycle_batch	3080.284343409128 iter/sec (stddev: 0.000013074652792384947)	2953.732831056772 iter/sec (stddev: 0.000012868614550593375)	0.96
benchmarks/test_guard_lifecycle.py::test_g7c_event_loop_floor_control	55472.303528412944 iter/sec (stddev: 0.000003842762886375086)	57077.15179104483 iter/sec (stddev: 0.0000022622446761981002)	1.03
benchmarks/test_guard_lifecycle.py::test_g7b_request_cycle_sync	367152.1458302274 iter/sec (stddev: 8.824478911899087e-8)	389157.9278170276 iter/sec (stddev: 7.538001071007417e-8)	1.06
benchmarks/test_guard_lifecycle.py::test_g13_teardown_at_scale	58360.6247919369 iter/sec (stddev: 0.0000016861269112308598)	58705.71321121978 iter/sec (stddev: 0.000002027004757550732)	1.01
benchmarks/test_guard_lifecycle.py::test_g13b_teardown_at_scale_async_no_finalizers	522.1604368508911 iter/sec (stddev: 0.001028486294179906)	530.1060244147608 iter/sec (stddev: 0.0008710323624485696)	1.02
benchmarks/test_guard_resolve.py::test_g1_transient_resolve	2186405.379567864 iter/sec (stddev: 2.5728731034662522e-8)	2092859.2218834385 iter/sec (stddev: 2.8607649076644558e-8)	0.96
benchmarks/test_guard_resolve.py::test_g2_cached_resolve	3648243.910500338 iter/sec (stddev: 1.05280974554512e-8)	3587410.3564403714 iter/sec (stddev: 2.4160135525755646e-8)	0.98
benchmarks/test_guard_resolve.py::test_g3_deep_chain	717576.3399881573 iter/sec (stddev: 6.045697053571199e-8)	653248.3788182421 iter/sec (stddev: 4.489908511937826e-8)	0.91
benchmarks/test_guard_resolve.py::test_g4_wide_resolve	458511.30640828225 iter/sec (stddev: 4.050493430796816e-7)	406743.0431135868 iter/sec (stddev: 3.7091997636303563e-7)	0.89
benchmarks/test_guard_resolve.py::test_g5_cross_scope	1958807.7422926885 iter/sec (stddev: 2.6918590015104546e-8)	1978364.8003841604 iter/sec (stddev: 2.0626363425857923e-8)	1.01
benchmarks/test_guard_resolve.py::test_g9_context_resolve	1299865.8603423696 iter/sec (stddev: 1.8383866252919707e-7)	1368063.6352061636 iter/sec (stddev: 1.3265064198257935e-7)	1.05
benchmarks/test_guard_resolve.py::test_g12_override_active_resolve	742061.2249489238 iter/sec (stddev: 6.555000368845746e-8)	674866.702016756 iter/sec (stddev: 5.734129134936555e-8)	0.91
benchmarks/test_guard_resolve.py::test_g18_alias_hop	3621655.631906842 iter/sec (stddev: 9.794307523807086e-9)	3746772.155789681 iter/sec (stddev: 1.1500269781559673e-8)	1.03
benchmarks/test_guard_validate.py::test_g10_validate_deep_chain	34406.178771709245 iter/sec (stddev: 0.000019378700661809042)	36397.55712222848 iter/sec (stddev: 0.00002006241299842051)	1.06
benchmarks/test_guard_validate.py::test_g11_validate_wide	20054.225020074613 iter/sec (stddev: 0.000026756737546112264)	21012.709789623445 iter/sec (stddev: 0.00002862112591767498)	1.05

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