Migrate the AI assistant to TanStack AI

[Mbeaulne]

Description

Migrates the active Tangle AI assistant runtime to TanStack AI while preserving the existing chat UI and editor tool bridge.

• Drives agent turns with TanStack AI's chat() and consumes native AG-UI events through the headless ChatClient.
• Defines shared editor and run-view tools with toolDefinition(), including client-side execution for browser-owned graph operations.
• Adds approval interrupts for graph mutations and pipeline submission, with clear approved and rejected states for batched changes.
• Keeps Run View read-only and bounds the agent loop by model iterations and total tool calls.
• Preserves interactive task, input, and output links in change summaries so users can focus the corresponding canvas entity.
• Handles stateless Responses API reasoning state across tool continuations.

The configured provider remains user-controlled; this does not add a hosted gateway, persistence layer, MCP integration, sandbox, or media/realtime surface.

Type of Change

• Bug fix
• New feature
• Improvement
• Cleanup/Refactor
• Breaking change
• Documentation update

Validation

• pnpm run typecheck
• pnpm run knip
• pnpm run lint
• Targeted Vitest coverage for the TanStack agent, tool definitions, approval UI, and agent thread
• pnpm run build

Screenshots (if applicable)

Old:

NEW:

Test Instructions

1. Configure an AI provider and model in AI Configuration.
2. Open a pipeline and ask the assistant to inspect or validate it; read-only tools should run without approval.
3. Ask the assistant to rename an entity or fix a validation issue.
4. Confirm each proposed graph mutation requires approval before it changes the pipeline.
5. Approve one proposed change and reject another; approved actions should appear green and rejected actions red while the batch is pending.
6. Complete the approval batch and confirm only approved changes are applied.
7. Confirm the final change summary renders tasks, inputs, and outputs as interactive chips that focus the corresponding canvas entity.
8. Open Run View and confirm status and debugging requests remain read-only.

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

[github-actions]

🎩 Preview

A preview build has been created at: add_tanstack_ai_for_our_agent/052ee9b