docs: replace vague provenance prose with recorded facts
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@@ -6,7 +6,7 @@ English | [中文](2026-07-08-interactive-side-sessions.zh.md)
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## Problem
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A user may want to explore a question from a live session without changing its main context. Existing primitives do not expose that product shape: [session-store fork](../../implemented/feature/2026-06-30-session-store-fork-api.md) creates an unattached session, while [fork subagents](../../implemented/feature/2026-06-21-subagent-capability-seam.md) are model-driven tasks whose transcript collapses into one tool result. Neither gives the user a separate conversation, and neither records a conclusion back into the parent with provenance.
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A user may want to explore a question from a live session without changing its main context. Existing primitives do not expose that product shape: [session-store fork](../../implemented/feature/2026-06-30-session-store-fork-api.md) creates an unattached session, while [fork subagents](../../implemented/feature/2026-06-21-subagent-capability-seam.md) are model-driven tasks whose transcript collapses into one tool result. Neither gives the user a separate conversation, and neither records a conclusion in the parent together with the side session that produced it.
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## Proposal
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@@ -23,7 +23,7 @@ Rewind productization, session-tree views, a model-facing side-session tool, and
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- **Use the subagent seam:** rejected because side sessions are user-driven, client-visible, and may outlive a parent turn; subagents are model-driven runs returning one tool result.
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- **Change the child system prompt:** rejected by default because any byte change invalidates the prefix cache from token zero. Deployments may still prefer that stronger separation.
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- **Add `sidechat/*` events:** deferred because a sourced `context/message` already provides durability, provenance, and replay. A dedicated event is justified only by a surface that needs distinct rendering.
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- **Add `sidechat/*` events:** deferred because a sourced `context/message` already records the content, producer, and replay input durably. A dedicated event is justified only by a surface that needs distinct rendering.
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- **Bind a protocol surface now:** rejected because current UIs are client-owned. Live presentation must eventually derive from the durable message so replay renders the same record.
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## Acceptance criteria
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