Add SWE debug environment

[rasdani]

Summary

• add SWEDebugEnv, a no-agent staged debugger for SWE-style SandboxTaskSet instances
• support optional task setup, one debug_step (none, gold_patch, command, script), and optional test/scoring at exit
• export SWEDebugEnv from the experimental composable modules and document it in the environment/reference docs
• remove SWE taskset-specific row filter shortcuts (filter_repos and SWE-rebench-V2 language) so row selection goes through the shared post-processed filter_fn path
• keep SWE-Smith's profile-coverage filter as a required supportability guard

Validation

• uv run ruff check verifiers/envs/experimental/composable/swe_debug_env.py verifiers/envs/experimental/composable/tasksets/swe
• uv run python -m py_compile verifiers/envs/experimental/composable/swe_debug_env.py
• git diff --check
• push hooks: ruff check, ruff format, Sync AGENTS.md from docs, ty (ci parity)

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Note

Medium Risk
Introduces a new sandbox-executing environment and changes SWE TaskSet constructor parameters (removing filter_repos/language shortcuts), which may break downstream callers and affects sandbox lifecycle/test execution paths.

Overview
Adds SWEDebugEnv, a no-agent environment that creates an SWE SandboxTaskSet sandbox, optionally runs task setup, performs a single debug action (gold_patch, command, or script), and optionally runs tests/scoring while recording detailed timing and output tails in state.

Exports SWEDebugEnv from verifiers.envs.experimental/composable and documents it in the environment and API reference docs.

Simplifies SWE taskset dataset selection by removing taskset-specific row-filter constructor args (e.g. filter_repos, MultiSWE exclude_langs, SWE-rebench-V2 language) in favor of the shared post-processed filter_fn mechanism.

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There are 3 total unresolved issues (including 2 from previous reviews).

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