# Sprint 88 Plan: Long-Horizon Drift Monitoring and Forecasting

## Context

Language ecosystems evolve. Sprint 88 predicts and mitigates future drift risks
before they degrade support tiers.

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## Goals

1. Monitor ecosystem/version drift risk across languages and runtimes
2. Forecast likely pair instability and maintenance demand
3. Preemptively schedule mitigation work
4. Protect LTS matrix from unplanned degradations

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## Steps

### Step 1109: Ecosystem drift signal model (12 tests)
### Step 1110: Pair stability forecasting engine (10 tests)
### Step 1111: Maintenance demand estimator (10 tests)
### Step 1112: Preventive mitigation planner (10 tests)
### Step 1113: Forecast confidence and uncertainty model (10 tests)
### Step 1114: Drift-triggered scheduling integration (8 tests)
### Step 1115: `whetstone_get_pair_stability_forecast` MCP tool (8 tests)
### Step 1116: `whetstone_plan_preventive_maintenance` MCP tool (8 tests)
### Step 1117: Drift outlook report artifact (8 tests)
### Step 1118: Sprint 88 integration summary + regression (8 tests)

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## Forecast Rule

- High-risk forecasted pairs are prioritized ahead of elective expansions.