feat(python): voice-agents v1 — background-tools

[github-actions]

Adds the background-tools recipe for voice-agents v1 (python).

Demonstrates background tool execution with filler speech — the agent speaks a filler phrase ("Let me check the weather...") while tools run in background threads, then injects the tool result back into the conversation. Eliminates dead silence during tool execution.

Pattern: FunctionCallRequest → send_inject_agent_message() (filler) → threading.Thread (tool runs) → send_function_call_response() (result)

Tools demonstrated:

• get_weather — fast (~300ms)
• search_db — slow (~1.5s)

Closes part of #542

[claude]

@deepgram/devrel — VP escalation: PR #546 has no CI checks and has been open >24h. The VP agent cannot dispatch workflows (GITHUB_TOKEN 403). Manual re-trigger of CI needed.

[claude]

@deepgram/devrel — VP escalation: PR #546 has had no CI checks run. The Lead — Test workflow was not triggered (likely due to GITHUB_TOKEN event propagation limitation). Manual re-trigger of Lead — Test workflow needed.

State: type:samples label, zero checks, last updated 2026-05-05

[claude]

@deepgram/devrel — VP escalation: PR #546 has no CI checks and has been stuck for >3 days. Workflow dispatch failed (GITHUB_TOKEN limitation). Manual trigger of Lead — Test workflow needed.

State: No checks have run. No review.

[claude]

@deepgram/devrel — VP escalation: PR #546 has been stuck for >48 hours with no CI checks running. workflow_dispatch for Lead — Test failed (GITHUB_TOKEN 403). Manual re-trigger or review needed.