feat: Add tool context and chat store#1023

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gadenbuie wants to merge 15 commits into

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feat/871-tool-context

Commits on Jun 16, 2026

feat(tool-context): add dynamic-scope stack and tool_context() accessors
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feat(chat): add chat$store active binding with deep clone
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feat(tool-context): thread context through tool invocation
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fix(parallel-chat): give each conversation an independent tool store
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docs: document tool context and chat$store
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docs: use email/auth-token store example in tool-calling vignette
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fix(tool-context): include system prompt in ctx$turns; clarify clone docs
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fix(tool-context): preserve store parent env when deep-cloning
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docs(tool-calling): Update `tool_context()` example and record casette
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fix(chat): override clone() to eagerly fork the store
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docs(NEWS): update store bullet to reflect clone() behavior
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docs(vignette): switch tool-context example to eval: false
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feat(tool-context): auto-promote plain lists to ellmer_tool_context
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docs(tool-context): remove Notes section from tool_context() docs
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refactor(tool-context): use withr::defer() in with_tool_context()
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