FE-1724: Remove the model-facing Brunch question marker

[kostandinang]

🌟 What is the purpose of this PR?

Remove the model-facing question replay marker so direct questions no longer require a marker tool call and extra model completion.

🔗 Related links

• FE-1724 (internal)
• Supersedes #9741, which GitHub locked to the Voice stack

🚫 Blocked by

• None.

🔍 What does this change?

• Stops mounting, prompting, and cataloguing both question-marker tool names.
• Preserves legacy marker parsing and hiding for existing conversation history.
• Verifies new questions complete in one provider call without marker data while full-response playback remains available.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• require changes to docs which are made as part of this PR

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

⚠️ Known issues

New responses intentionally do not offer “Repeat question”; historical marked questions remain compatible.

🐾 Next steps

None.

🛡 What tests cover this?

• Core and transport unit tests for absent mounting and legacy projection.
• Website Voice tests for full-response speech without a repeatable question segment.
• Brunch integration tests for a marker-free, single-completion question turn.

❓ How to test this?

1. Run the affected unit and integration suites.
2. Ask a direct question through Brunch.
3. Confirm the response completes normally without a marker tool call and remains available to “Read full response”.

📹 Demo

Not applicable; this removes internal tool orchestration without changing the rendered response.

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