added new prompt to topic relevance

[rkritika1508]

Summary

Target issue is #122.
Explain the motivation for making this change. What existing problem does the pull request solve?
Added two prompts for topic relevance -

• v2.md — New prompt template for forbidden-topics-only configuration. Scores messages based purely on exclusion logic: forbidden topics score 1, clearly safe messages score 3. Useful when the bot has no allowed-topic allowlist, only a blocklist (e.g. Sneha's gender detection use case).
• v3.md — New prompt template for mixed allowed + forbidden configuration. Forbidden topics take priority (score 1), then allowed topics are checked (score 3), with ambiguous/overlapping cases landing at 2. Useful when both an allowlist and a blocklist are defined.
• These complement the existing v1.md (allowed-topics-only) without any DB schema changes — callers simply set prompt_schema_version: 2 or 3 on their topic_relevance config row.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Please add here if any other information is required for the reviewer.

Summary by CodeRabbit

• New Features

  • Enhanced query classification system with improved topic relevance assessment for more accurate content validation and filtering.

• Chores

  • Updated scope validation configuration with new scoring parameters for improved message assessment.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR introduces two versions of scope classifier prompts for evaluating WhatsApp bot message relevance against configured topic restrictions. Both prompts use a 3-point scoring rubric and include instructions to evaluate messages against forbidden and allowed topics while ignoring override attempts.

Changes

Topic Scope Classification

Layer / File(s)	Summary
Scope classifier prompts (v2 and v3) backend/app/core/validators/prompts/topic_relevance/v2.md, backend/app/core/validators/prompts/topic_relevance/v3.md	Two prompt versions define scope classification logic with 3-point scoring rubrics for determining whether messages fall within forbidden topic exclusions or allowed scopes. Both are parameterized with {{TOPIC_CONFIGURATION}} and include explicit evaluation order (forbidden-first in v3) and instructions to reject scope override attempts.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

A rabbit whispers scope divine,
Score three in bounds, score one the line—
For ambiguity, two shall reign,
No tricks can override our domain!
These prompts guard messages with care,
Topic validation everywhere! 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding two new prompt templates (v2.md and v3.md) to the topic_relevance prompt directory.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/topic-relevance-prompts

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