# Sprint 82 Plan: External Verifier Integrations and Evidence Federation

## Context

Large deployments require independent verification sources. Sprint 82 enables
federated evidence from external verifiers and toolchains.

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## Goals

1. Integrate external verification providers into acceptance contracts
2. Normalize external evidence into internal trust model
3. Resolve conflicting verifier outcomes with deterministic policy
4. Improve confidence through independent corroboration

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## Steps

### Step 1049: External verifier adapter interface (12 tests)
### Step 1050: Evidence normalization schema (10 tests)
### Step 1051: Verifier trust weighting policy engine (10 tests)
### Step 1052: Conflict resolution model for verifier disagreement (10 tests)
### Step 1053: Federated evidence bundle composer (10 tests)
### Step 1054: Verifier outage/degradation fallback strategy (8 tests)
### Step 1055: `whetstone_register_external_verifier` MCP tool (8 tests)
### Step 1056: `whetstone_get_federated_verification_report` MCP tool (8 tests)
### Step 1057: Cross-verifier consistency dashboard model (8 tests)
### Step 1058: Sprint 82 integration summary + regression (8 tests)

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## Trust Rule

- Low-trust verifier evidence can inform but not independently approve promotion.