chore(terminal-bench): merge main, retarget graduated compaction import

Merge `origin/main` (brings in the experimental->top-level capability
graduation) and update the benchmark's compaction import from the now-deprecated
`pydantic_ai_harness.experimental.compaction` shim to the canonical
`pydantic_ai_harness.compaction`. Drops the now-obsolete experimental-warning
filter. Benchmark behavior is unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

benchmarks/terminal_bench/pyproject.toml

@@ -57,7 +57,3 @@ include = ['src']
 [tool.pytest.ini_options]
 testpaths = ['tests']
 anyio_mode = 'auto'
-filterwarnings = [
-    # Harness compaction capabilities are experimental and warn on import.
-    'ignore::pydantic_ai_harness.experimental.HarnessExperimentalWarning',
-]

benchmarks/terminal_bench/src/pydantic_ai_harness_terminal_bench/agent.py

@@ -26,7 +26,7 @@ from pydantic_ai import Agent
 from pydantic_ai.capabilities import AbstractCapability
 from pydantic_ai.models import Model
 from pydantic_ai.settings import ModelSettings
-from pydantic_ai_harness.experimental.compaction import (
+from pydantic_ai_harness.compaction import (
     ClearToolResults,
     SummarizingCompaction,
     TieredCompaction,

benchmarks/terminal_bench/tests/test_agent.py

@@ -7,7 +7,7 @@ from pydantic_ai import Agent
 from pydantic_ai.messages import ModelMessage, ModelResponse, TextPart, ToolCallPart, ToolReturnPart
 from pydantic_ai.models.function import AgentInfo, FunctionModel
 from pydantic_ai.models.test import TestModel
-from pydantic_ai_harness.experimental.compaction import TieredCompaction
+from pydantic_ai_harness.compaction import TieredCompaction
 
 from pydantic_ai_harness_terminal_bench.agent import build_agent, build_compaction
 from pydantic_ai_harness_terminal_bench.tools import CommandResult, TerminalBenchDeps