feat: add client tool abort signal

[blove]

Summary:

• Add FunctionToolHandlerContext with an AbortSignal for function client-tool handlers.
• Pass handler context through executeFunctionTool while preserving existing one-argument handlers.
• Abort in-flight function client tools on agent stop and injector teardown, and suppress resolve after abort.
• Regenerate chat API docs for the new public type.

Test Plan:

• npx vitest run src/lib/client-tools/execute.spec.ts src/lib/client-tools/tools.type-spec.ts --config vite.config.mts (from libs/chat; red then green)
• npx vitest run src/lib/client-tools/client-tool-executor.spec.ts --config vite.config.mts (from libs/chat; red then green)
• npm run generate-api-docs
• npx nx test chat
• npx nx test ag-ui
• npx nx test langgraph
• Lint error count: 0 for chat, ag-ui, and langgraph
• git diff --check
• git diff --cached --check
• post-rebase npx nx test chat
• post-rebase git diff --check origin/main...HEAD

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Project	Deployment	Actions	Updated (UTC)
threadplane	Ready	Preview, Comment	Jul 8, 2026 3:21pm

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