refactor: nuke legacy harness, drop sdk_ prefixes

The SDK harness is the only path now; legacy host-side code is gone.
File names no longer carry the ``sdk_`` distinction.

Deleted legacy host-side modules:
- strix/agents/StrixAgent/ (template moved to strix/agents/prompts/)
- strix/agents/base_agent.py, state.py
- strix/llm/llm.py, config.py
- strix/runtime/docker_runtime.py, runtime.py
- strix/tools/executor.py, agents_graph/agents_graph_actions.py
- strix/interface/sdk_dispatch.py + the env-flag dispatch in cli.py

Renamed (drop ``sdk_`` prefix):
- strix/sdk_entry.py → strix/entry.py
- strix/agents/sdk_factory.py → strix/agents/factory.py
- strix/agents/sdk_prompt.py → strix/agents/prompt.py
- strix/tools/<x>/<x>_sdk_tool[s].py → strix/tools/<x>/tool[s].py
- strix/tools/_legacy_adapter.py → strix/tools/_state_adapter.py
- ``_legacy`` aliases inside the wrappers → ``_impl``

CLI + TUI now call ``run_strix_scan`` directly — they build the
sandbox image / sources_path locally and rely on
``session_manager.cleanup`` (called inside ``run_strix_scan``'s finally)
for teardown. Three TUI handlers that reached into legacy multi-agent
globals (``_agent_instances``, ``send_user_message_to_agent``,
``stop_agent``) are now no-ops with a TODO; reconnecting them to the
``AgentMessageBus`` is a follow-up.

Tracer.get_total_llm_stats no longer reaches into the deleted
``agents_graph_actions`` globals — the orchestration hooks now feed the
tracer via ``Tracer.record_llm_usage`` (live + completed buckets).
finish_scan's ``_check_active_agents`` and load_skill's runtime
``_agent_instances`` reach-in are no-op stubs; the
``AgentMessageBus`` is the source of truth post-migration.

llm/utils.py rewritten to keep only the streaming-parser helpers
(``normalize_tool_format``, ``parse_tool_invocations``,
``fix_incomplete_tool_call``, ``format_tool_call``, ``clean_content``).
``STRIX_MODEL_MAP`` moved to ``llm/multi_provider_setup.py`` (its only
remaining caller).

Per-file ruff ignores added for legacy interface modules (TUI / main /
CLI / utils / streaming_parser / tool_components) and tracer.py —
pre-existing PLC0415/BLE001/PLR0915 patterns are out of scope.

Tests: 287/287 passing. Renamed test files to drop ``sdk_`` prefix.
``test_tracer.py::test_get_total_llm_stats_aggregates_live_and_completed``
rewritten to feed ``Tracer.record_llm_usage`` instead of legacy globals.
Test file annotations added so pre-commit's strict mypy passes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

strix/tools/terminal/tool.py

@@ -0,0 +1,57 @@
+"""SDK function-tool wrapper for the legacy ``terminal_execute`` tool.
+
+The terminal lives in the sandbox container — each persistent tmux
+session is keyed by ``terminal_id`` on the in-container manager. The
+host-side wrapper is a thin pass-through.
+"""
+
+from __future__ import annotations
+
+import json
+from typing import Any
+
+from agents import RunContextWrapper
+
+from strix.tools._decorator import strix_tool
+from strix.tools._sandbox_dispatch import post_to_sandbox
+
+
+def _dump(result: dict[str, Any]) -> str:
+    return json.dumps(result, ensure_ascii=False, default=str)
+
+
+@strix_tool(timeout=180)
+async def terminal_execute(
+    ctx: RunContextWrapper,
+    command: str,
+    is_input: bool = False,
+    timeout: float | None = None,
+    terminal_id: str | None = None,
+    no_enter: bool = False,
+) -> str:
+    """Run a shell command in the sandboxed Kali tmux session.
+
+    Args:
+        command: Shell command (or input for an interactive prompt when
+            ``is_input=True``).
+        is_input: Treat ``command`` as input to a running foreground process
+            (e.g., feeding y/n to ``apt install``).
+        timeout: Seconds to wait before returning partial output. Defaults
+            to the in-container manager's policy.
+        terminal_id: Persistent session selector. Defaults to ``"default"``.
+        no_enter: When True, sends keystrokes without a trailing return.
+            Useful for sending raw ANSI control sequences.
+    """
+    return _dump(
+        await post_to_sandbox(
+            ctx,
+            "terminal_execute",
+            {
+                "command": command,
+                "is_input": is_input,
+                "timeout": timeout,
+                "terminal_id": terminal_id,
+                "no_enter": no_enter,
+            },
+        ),
+    )