Add durable receipt auditing for guarded Antigravity backend dispatch

[Copilot]

Canonical issue

Linked by automation.

Outcome

Adds an optional, guarded Google Antigravity managed backend path in Agent Factory with durable receipt persistence at orchestration time. MCP/tool guardrails remain strict and audit records capture execution metadata without persisting task context.

Scope

• Included:
  • Orchestrator durability hook: AgentOrchestrator now accepts an optional audit_store and records a durable entry on execute_antigravity_backend.
  • Receipt-focused audit payload: persists provider/agent/status, receipt/request hash, interaction/environment IDs, budget flag, policy, and token fields.
  • Context redaction guarantee: audit details intentionally exclude execution context payloads.
  • Targeted regression coverage: added a unit test that verifies durable recording semantics and no context leakage.
  • Minimal hygiene in touched files: import-order/type-import cleanup needed by lint in modified files.
• Explicitly excluded:
  • No change to provider transport wiring, live-call approval policy, or MCP allowlist semantics.
  • No new API endpoints, storage schema changes, or UI updates.

Risk

• Risk level: low
• Failure mode: audit store append failures could drop receipt persistence while managed execution still completes.
• Rollback: revert orchestrator audit_store hook and associated test.

Verification

List exact automated and manual checks, tied to the current head SHA.

• Focused tests
• Required CI
• Review threads resolved

Production evidence

Not applicable: backend orchestration/internal audit-path change only; no production surface or deployment behavior change.

Agent handoff

• One canonical issue is linked
• No competing PR implements the same issue
• Acceptance criteria are satisfied
• Required checks pass on the current head
• Human decision is requested only for product, security, irreversible infrastructure, or production approval

# New orchestration durability path (simplified)
orchestrator = AgentOrchestrator(audit_store=audit_store)
receipt = await orchestrator.execute_antigravity_backend(
    backend=backend,
    task="review",
    context={"video_pack_id": "pack-3"},
)
# audit_store receives receipt metadata, not raw context

• Fixes Add guarded Antigravity backend to Agent Factory #1651

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Project	Deployment	Actions	Updated
v0-uvai	Ready	Preview, v0	Sep 8, 2026 11:04pm UTC

[vercel]

Durable audit recording for the Antigravity backend stores usage.total_tokens in the input_tokens field, mislabeling token accounting (input = input+output).