a2a-market-stake-freeze（a2a 市场份额冻结）

a2a-Market Stake Freeze

Build the rule engine shell for stake lock lifecycle in A2A transactions.

Current status: registration-first scaffold with explicit policy points.

Scope

• Lock stake when node accepts an intent or enters negotiation.
• Release or slash stake based on final outcome and policy.
• Keep stake decisions auditable for dispute resolution.

Suggested Project Layout

• app/domain/rules/stake_rules.py
• app/application/services/stake_service.py
• app/infrastructure/db/stake_repository.py
• app/infrastructure/tasks/stake_timeout_worker.py

Minimum Contracts (MVP P0)

1. freeze_stake(node_id, intent_id, amount) returns lock record.
2. release_stake(lock_id, reason) closes lock and restores available stake.
3. slash_stake(lock_id, reason, evidence) applies penalty and emits incident log.
4. evaluate_timeout_locks(now_ts) handles automatic release/slash decisions.

Policy Baseline

• Lock amount should be deterministic from intent risk tier.
• Slashing requires evidence payload and policy version.
• Timeout defaults to release unless explicit breach condition is met.

Events

• Emit NEGOTIATION_STARTED when stake lock is confirmed.
• Emit risk/stake incident events for policy engine and logging.

Implementation Backlog

• Add dynamic stake multipliers by market volatility.
• Add external arbitration hook for manual dispute outcomes.

Runtime Implementation

• Status: implemented in local runtime package.
• Primary code paths:
• runtime/src/domain/stake-policy.js
• Validation: covered by runtime/tests and npm test in runtime/.