apply_patch

SDK-provided file patching tool — the agent's only first-class way to edit files in the sandbox. Surfaced to the model as patch (renamed via _TOOL_NAME_OVERRIDES in strix/agents/factory.py).

Implementation: agents.sandbox.capabilities.tools.apply_patch_tool.ApplyPatchTool (upstream agents SDK)
Wired in: strix/agents/factory.py — added per-run via the SDK Filesystem capability.