Closes#624, #622, #601, #599, #577
## LLM JSON parsing (#624 / #622 / #601)
- New `_parse_llm_json()` in llm_client.py with 5-stage fallback:
1. Strip markdown fences (existing)
2. Strict json.loads (fast path)
3. json.JSONDecoder.raw_decode (handles trailing prose after JSON)
4. Balanced-brace extraction (leading prose + embedded JSON)
5. Strip control chars + retry
- Replaces strict json.loads in chat_json() that was failing on any LLM
appending text after the JSON (common with qwen-plus, ollama, gemma even
with response_format=json_object).
- Logs which fallback was used so problematic LLMs are visible.
- 8 unit-test cases covering each strategy.
## Report section tool_call leak (#599)
- New `_sanitize_section_content()` in report_agent.py detects when a
section's "final answer" is actually an unexecuted tool_call JSON
(e.g. `{"name":"quick_search","parameters":{...}}`) and replaces it
with a clear fallback message instead of writing the raw artifact to
the report.
- Applied at all 3 places where final_answer is returned in
write_section(): the Final Answer path, the no-prefix fallback, and
the force-finalize path.
## Chat history duplicate user message (#577)
- In report_agent.py chat(), defensively dedupe chat_history:
- Only keep {role, content} from history items
- Skip entries that match the current message exactly
- This prevents LLM from seeing a duplicate trailing user message and
echoing back the previous answer.
- Added debug log of constructed messages array for diagnostics.
Background threads (graph building, simulation prep, report generation,
profile generation) now inherit the requesting user's locale preference.
Previously these fell back to 'zh' because Flask request context was
unavailable in spawned threads.
- Updated README.md to include new simulation scripts and configuration details for OASIS, including API retry mechanisms and environment variable settings.
- Added simulation management and configuration generation services to streamline the simulation process across Twitter and Reddit platforms.
- Introduced new API routes for simulation-related operations, including entity retrieval and simulation status management.
- Implemented a robust retry mechanism for external API calls to improve system stability.
- Enhanced task management model to include detailed progress tracking.
- Added logging capabilities for action tracking during simulations.
- Included new scripts for running parallel simulations and testing profile formats.
- Updated `run.py` to conditionally print startup information only in the reloader process to avoid duplicate logs in debug mode.
- Modified `__init__.py` to log startup and completion messages based on the reloader process condition.
- Added warnings suppression in `graph_builder.py` for Pydantic v2 regarding Field usage.
- Revised `ontology_generator.py` to enforce strict design guidelines for entity types and relationships, ensuring compliance with new requirements.
- Improved logging behavior in `logger.py` to prevent log propagation to the root logger, avoiding duplicate outputs.
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