Add live Agent activity to Workflow Studio

[egagofur]

What changed

• Stream real AI Agent activity into Workflow Studio with reconnect-safe events.
• Show working, idle, waiting, and disconnected states on nodes and connectors.
• Keep terminal and Studio Goal drafts synchronized with revision and hash protection.
• Add Follow Execution while preserving manual canvas control.
• Mirror Agent questions into Run interactions.
• Update host instructions so supported Agents publish safe progress automatically.
• Prepare release v1.9.4.

Steps to Reproduce & Testing (QA)

1. Start or resume a recipe-backed Run.
2. Open Workflow Studio and publish a Goal draft from the terminal.
3. Confirm the Goal form updates before freeze.
4. Emit heartbeat or node activity and confirm the active node and connector update.
5. Pan the canvas and confirm Follow Execution pauses; resume it from the live panel.
6. Confirm reduced-motion preference removes traveling and pulsing animation.

Verified with:

• npm test — 246 passed
• npm run doctor — READY
• npm run eval — 20 valid cases
• node scripts/verify-release.js v1.9.4
• git diff --cached --check

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