[lesnik512]

Summary

CPython 3.15.0 is out. This adds 3.15 and 3.15t to the pytest matrix and the 3.15 classifier.

3.15 stays out of the floors matrix for now. The asyncpg floor (0.31.0) has no 3.15 wheels; 0.32.0 is the first release with them. The dev group's faststream[kafka] also pulls aiokafka, which has no 3.15 wheels in any release. Add 3.15 to floors once aiokafka ships 3.15 wheels and the asyncpg floor is at 0.32.0 or later. The floors job installs with --no-build, so it cannot pass on 3.15 until then. Users on 3.15 get newer versions that install, and pytest covers those.

Changes

• _checks.yml: add 3.15 and 3.15t to pytest. Every check keyed on 3.14t now matches any t build.
• pyproject.toml: add the Programming Language :: Python :: 3.15 classifier.
• docs/introduction/installation.md now names 3.15t next to 3.14t, both as a CI target and as a build with free-threaded wheels for asyncpg, SQLAlchemy and pydantic-core.

Checklist

• Every job with a 3.15 entry passes locally on 3.15.0 and 3.15.0t, run step by step from this _checks.yml with the same service containers
• The floors install fails locally on 3.15 for the reason above

[github-actions]

Benchmark gate

✅ gate passed

scenario	msg/s	delete/msg	WALrec/msg	WALB/msg	fpi	upd	del	dead_tup
consumer/w1/b10	2229	1.000	6.72	922	242	5000	5000	10000
consumer/w1/b100	2625	1.000	7.11	1154	243	5000	5000	10000
consumer/w2/b10	3028	1.000	6.71	922	242	5000	5000	10000
consumer/w2/b100	3739	1.000	7.11	1154	243	5000	5000	10000
consumer/w4/b10	3048	1.000	6.73	949	242	5000	5000	10000
consumer/w4/b100	3785	1.000	7.11	1153	243	5000	5000	10000
consumer/w1/b100/tfbs100	10455	0.010	6.11	1130	243	5000	5000	10000
consumer/w1/b100/interval1-10	2503	1.000	7.11	1154	243	5000	5000	10000
producer/w1/b100	6641	0.000	3.04	597	1	0	0	0
producer/w1/b100/ppt1	1831	0.000	4.04	635	0	0	0	0

Gated (fails the build): delete_calls + tuple counters (upd/del/ins) + the producer's insert_calls, exact; select_calls and other_calls within +2; wal_records within a 10% band; fetch_calls within 2x. msg/s, WAL bytes and total calls are informational (timing/FPI noise).