progress: ReductiveGroups report for 2026-08-27

[mccorvie]

This PR records progress on the ReductiveGroups roadmap for the window c4d7989..cfd9d50 of TauCeti main, covering 180 merged pull requests.

STATUS.md is rewritten as a snapshot at cfd9d50; PROGRESS.md gains one appended section for the window. Both files are machine-owned and their prose is not security-validated.

Pull requests in the window: #3548, #3604, #3631, #3663, #3677, #3712, #3741, #3748, #3753, #3757, #3758, #3761, #3774, #3777, #3778, #3786, #3788, #3791, #3798, #3799, #3801, #3814, #3821, #3825, #3826, #3827, #3835, #3841, #3842, #3843, #3847, #3848, #3851, #3856, #3858, #3860, #3873, #3874, #3876, #3890, #3893, #3911, #3917, #3922, #3925, #3927, #3931, #3933, #3934, #3936, #3938, #3939, #3940, #3942, #3943, #3951, #3952, #3958, #3968, #3970, #3973, #3975, #3978, #3979, #3984, #3989, #3992, #4032, #4035, #4046, #4062, #4067, #4073, #4077, #4082, #4089, #4093, #4098, #4104, #4111, #4112, #4113, #4115, #4121, #4127, #4130, #4139, #4145, #4152, #4154, #4159, #4185, #4200, #4215, #4225, #4228, #4230, #4236, #4240, #4251, #4253, #4263, #4266, #4277, #4290, #4293, #4298, #4303, #4305, #4317, #4321, #4323, #4327, #4337, #4342, #4347, #4357, #4359, #4361, #4363, #4375, #4388, #4393, #4394, #4396, #4398, #4403, #4416, #4434, #4436, #4440, #4441, #4442, #4451, #4456, #4470, #4474, #4477, #4480, #4489, #4493, #4502, #4527, #4536, #4561, #4577, #4579, #4580, #4581, #4583, #4585, #4587, #4588, #4591, #4598, #4605, #4614, #4620, #4625, #4636, #4647, #4661, #4666, #4674, #4687, #4695, #4698, #4707, #4724, #4734, #4742, #4746, #4747, #4752, #4754, #4756, #4761, #4768, #4779, #4784

Generated by TauCetiProgress at 880e8b9737973bfbd8f1f214f4ac2ded67f5b856.

🤖 Prepared with Claude Code

[github-actions]

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