# Sprint 90 Plan: Decade-Scale Roadmap Lock and Governance Refresh

## Context

Sprint 90 consolidates long-term governance, refreshes constitutional program
assumptions, and sets the next decade-scale direction.

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## Goals

1. Refresh governance model with accumulated program evidence
2. Lock next long-horizon roadmap phases and review cadence
3. Formalize deprecation, succession, and stewardship policies
4. Publish program constitution update and operating handbook

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## Steps

### Step 1129: Governance model refresh framework (12 tests)
### Step 1130: Long-horizon roadmap planning engine v2 (10 tests)
### Step 1131: Stewardship and ownership policy model (10 tests)
### Step 1132: Deprecation/succession lifecycle framework (10 tests)
### Step 1133: Constitutional invariants compliance checker (10 tests)
### Step 1134: Governance change-impact simulator (8 tests)
### Step 1135: `whetstone_get_governance_state` MCP tool (8 tests)
### Step 1136: `whetstone_publish_roadmap_epoch` MCP tool (8 tests)
### Step 1137: Program constitution + handbook publication bundle (8 tests)
### Step 1138: Sprint 90 integration summary + full-program regression (8 tests)

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## Constitutional Rule

- Governance changes must preserve core safety and review invariants.