docs(routing): clarify user-turn session requirement

[ketpatil77]

Summary

• document that classify_trigger = "user_turn" retains a target only when requests carry a session ID
• clarify that requests without a session ID behave like every_request
• apply the same wording to capability and custom classifier configuration tables

Addresses the documentation portion of #495. This PR intentionally does not change message_hash_fallback validation or runtime behavior.

Verification

• uv sync --only-group docs
• uv run --only-group docs mkdocs build --strict
• git diff --check

The strict documentation build completed without warnings.

Summary by CodeRabbit

• Documentation
  • Clarified user_turn trigger behavior for capability and custom LLM classifier routes.
  • Documented that selected targets persist across tool calls only when a session ID is provided; otherwise, behavior matches every_request.

[nachiketb-nvidia]

Thank you! pls dont forget to take it out of draft if its ready

[coderabbitai]

Walkthrough

The documentation now states that user_turn retains classifier target affinity across tool calls only when a session ID is present. Requests without a session ID are classified on every request.

Changes

Classifier documentation

Layer / File(s)	Summary
Document session-dependent classifier behavior docs/reference/toml_schema.md	Clarifies session ID requirements and no-session fallback behavior for capability and custom classifier routes.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to e2f60

This docs-only change affects wording in two schema-table entries and does not change runtime behavior. The PR is merge-ready after normal review, with no actionable merge-blocking risk.

Poem

A rabbit reads the schema at dawn
user_turn keeps its target drawn
With a session, tools stay aligned
Without one, each request is assigned
Clear words help every route run right

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the documentation change: it clarifies the session requirement for user-turn routing.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@docs/reference/toml_schema.md`:
- Line 158: In docs/reference/toml_schema.md lines 158-158 and 187-187, replace
the grammatically incomplete user_turn wording in both capability-mode and
custom-classifier-route tables with one precise, identical definition that
states it judges each new user message, retains the target across intervening
tool calls only when a session ID is present, and otherwise behaves like
every_request.

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• docs/reference/toml_schema.md

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[grahamking]

@ketpatil77 Could you look at the Code Rabbit review and fix the language ("between only when")? When it's done reply to the Code Rabbit review with what you did, and then Resolve it.