refactor: root-package imports (svc/runtime/interfaces) and fix PYTHONPATH

- Rename platform/ to svc/ to avoid shadowing stdlib platform.
- Replace from oclaw.* with from svc/runtime/interfaces; update -m CLI paths.
- tests/conftest: prepend repo root to sys.path (no parent-folder package name).
- CI: paths and offline_eval script under repo root.
- Ops scripts: PYTHONPATH must be repo root for python -m runtime.* (fixes gateway/WhatsApp sidecar startup).
- Fix default oclaw.json path in tabular/file attachment limits; stabilize attachment test config.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/plan_agent_v2/trace.py

@@ -19,7 +19,7 @@ def emit_plan_agent_v2_trace(
     merged.setdefault("pipeline", "plan_agent_v2")
     merged.setdefault("ts_ms", int(time.time() * 1000))
     try:
-        from oclaw.runtime.orchestration.trace import new_span_id
+        from runtime.orchestration.trace import new_span_id
 
         store.add_trace_event(
             session_id=str(session_id or ""),