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>

platform/files/session_export.py

@@ -1,66 +0,0 @@
-from __future__ import annotations
-
-import json
-from typing import Any
-
-from oclaw.platform.persistence.sqlite_store import ChatMessage, SqliteStore
-
-
-def export_session_json(store: SqliteStore, session_id: str, message_limit: int = 50_000) -> str:
-    title = ""
-    s = store.get_session(session_id)
-    if s:
-        title = s.title
-    msgs = store.get_messages(session_id=session_id, limit=message_limit)
-    payload: dict[str, Any] = {
-        "session_id": session_id,
-        "title": title,
-        "messages": [_message_to_dict(m) for m in msgs],
-    }
-    return json.dumps(payload, ensure_ascii=False, indent=2)
-
-
-def export_session_markdown(store: SqliteStore, session_id: str, message_limit: int = 50_000) -> str:
-    s = store.get_session(session_id)
-    title = (s.title if s else "") or session_id[:12]
-    lines = [f"# {title}", "", f"Session: `{session_id}`", ""]
-    for m in store.get_messages(session_id=session_id, limit=message_limit):
-        lines.extend(_message_to_markdown_lines(m))
-        lines.append("")
-    return "\n".join(lines).rstrip() + "\n"
-
-
-def _message_to_dict(m: ChatMessage) -> dict[str, Any]:
-    return {
-        "id": m.id,
-        "role": m.role,
-        "content": m.content,
-        "tool_calls": m.tool_calls,
-        "attachments": m.attachments,
-        "timestamp": m.timestamp,
-    }
-
-
-def _message_to_markdown_lines(m: ChatMessage) -> list[str]:
-    role = m.role.upper()
-    ts = m.timestamp or ""
-    head = f"## {role} · `{m.id}` · {ts}"
-    body = m.content or ""
-    if m.role == "tool" and m.tool_calls:
-        head = f"## TOOL · `{m.id}` · {ts}"
-    lines = [head, ""]
-    if body.strip():
-        lines.append(body)
-        lines.append("")
-    if m.tool_calls and m.role != "tool":
-        lines.append("```json")
-        lines.append(m.tool_calls)
-        lines.append("```")
-    elif m.tool_calls and m.role == "tool":
-        lines.append(f"_meta_: `{m.tool_calls}`")
-    if m.attachments:
-        lines.append("_attachments_: see JSON export for full data.")
-    return lines
-
-
-__all__ = ["export_session_json", "export_session_markdown"]