# Implementation Plan

## Plan format

1. Milestone breakdown
2. File/module touch list
3. Contract changes (API/SDK)
4. Test additions and coverage expectations
5. Rollout sequence and fallback strategy

## Milestone model

- M1: baseline extraction + RFC alignment
- M2: API contract implementation
- M3: SDK integration implementation
- M4: observability and reliability hardening
- M5: docs + migration notes + release checks

## Required validation gates

- Contract tests for API/SDK behavior
- Integration tests against vendor sandbox or stable mocks
- Failure-path validation (timeouts, rate limits, partial failures)
- Backward compatibility checks for existing consumers
