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>

pyproject.toml

@@ -286,20 +286,22 @@ ignore = [
 ]
 # SDK function-tool wrappers: the SDK calls get_type_hints() at registration
 # time to derive the JSON schema, which evaluates annotations at runtime —
-# so RunContextWrapper must be imported eagerly, not under TYPE_CHECKING.
-"strix/tools/todo/todo_sdk_tools.py" = ["TC002"]
-"strix/tools/notes/notes_sdk_tools.py" = ["TC002"]
-"strix/tools/thinking/thinking_sdk_tools.py" = ["TC002"]
-"strix/tools/web_search/web_search_sdk_tool.py" = ["TC002"]
-"strix/tools/file_edit/file_edit_sdk_tools.py" = ["TC002"]
-"strix/tools/reporting/reporting_sdk_tools.py" = ["TC002"]
-"strix/tools/load_skill/load_skill_sdk_tool.py" = ["TC002"]
-"strix/tools/finish/finish_sdk_tool.py" = ["TC002"]
-"strix/tools/browser/browser_sdk_tool.py" = ["TC002"]
-"strix/tools/terminal/terminal_sdk_tool.py" = ["TC002"]
-"strix/tools/python/python_sdk_tool.py" = ["TC002"]
-"strix/tools/proxy/proxy_sdk_tools.py" = ["TC002"]
-"strix/tools/agents_graph/agents_graph_sdk_tools.py" = ["TC002"]
+# so RunContextWrapper / Tool / TResponseInputItem must be imported eagerly,
+# not under TYPE_CHECKING.
+"strix/tools/todo/tools.py" = ["TC002"]
+"strix/tools/notes/tools.py" = ["TC002"]
+"strix/tools/thinking/tool.py" = ["TC002"]
+"strix/tools/web_search/tool.py" = ["TC002"]
+"strix/tools/file_edit/tools.py" = ["TC002"]
+"strix/tools/reporting/tool.py" = ["TC002"]
+"strix/tools/load_skill/tool.py" = ["TC002"]
+"strix/tools/finish/tool.py" = ["TC002"]
+"strix/tools/browser/tool.py" = ["TC002"]
+"strix/tools/terminal/tool.py" = ["TC002"]
+"strix/tools/python/tool.py" = ["TC002"]
+"strix/tools/proxy/tools.py" = ["TC002"]
+"strix/tools/agents_graph/tools.py" = ["TC002"]
+"strix/agents/factory.py" = ["TC002"]
 # CaidoCapability uses agents.tool.Tool at runtime — pydantic Field
 # annotations and the cached _CAIDO_TOOLS tuple need it eagerly.
 "strix/sandbox/caido_capability.py" = ["TC002"]
@@ -311,11 +313,23 @@ ignore = [
 # resolution past where mypy needs it. ``_build_root_task`` legitimately
 # walks every supported target type — splitting it into per-type
 # helpers would add indirection without simplifying anything.
-"strix/sdk_entry.py" = ["TC003", "PLR0912"]
+"strix/entry.py" = ["TC003", "PLR0912"]
+# Legacy tracer module — pre-existing PLR/E501 patterns; full refactor
+# is out of scope for the harness migration. ``Callable`` is a runtime
+# annotation on ``vulnerability_found_callback``.
+"strix/telemetry/tracer.py" = ["TC003", "PLR0912", "PLR0915", "E501"]
 # Legacy interface utility with intentionally many branches per supported
 # scope-mode / target-type combination; refactor would obscure the
 # decision tree without simplifying it.
-"strix/interface/utils.py" = ["PLR0912"]
+"strix/interface/utils.py" = ["PLR0912", "BLE001", "PLC0415"]
+# CLI / TUI / main keep extensive lazy imports + broad exception swallows
+# for resilience around terminal-rendering errors. Refactor is out of
+# scope for the harness migration.
+"strix/interface/cli.py" = ["BLE001", "PLC0415"]
+"strix/interface/tui.py" = ["BLE001", "PLC0415", "PLR0912", "PLR0915", "SIM105"]
+"strix/interface/main.py" = ["BLE001", "PLC0415", "PLR0912", "PLR0915"]
+"strix/interface/streaming_parser.py" = ["PLC0415"]
+"strix/interface/tool_components/agent_message_renderer.py" = ["PLC0415"]
 # Sandbox dispatch helper has many short-circuit error returns (auth fail,
 # size cap, decode fail, etc). Each is a distinct, documented failure mode
 # the model needs to see verbatim — collapsing them harms readability.