Modernize (Brownfield Dependency Upgrade)

Runs after Gear 6 for brownfield projects with modernize: true in .stackshift-state.json.

Prerequisites: Gears 1-6 complete, 100% spec coverage established Output: Modern dependency versions, updated tests, synchronized specs, upgrade report Scope: Node.js/TypeScript projects only

Constraints

• Do NOT upgrade to pre-release, beta, or canary versions. Use only stable releases.
• Do NOT delete lockfiles (package-lock.json, yarn.lock, pnpm-lock.yaml).
• Do NOT run npm audit fix --force. Use npm audit fix only.
• Do NOT proceed to the next phase until the current phase passes its gate check.
• Execute phases sequentially. No phases run in parallel.
• If /speckit.analyze is unavailable, manually compare spec acceptance criteria against test results as a fallback.