docs: Add deployment checklist for mainnet contract deployment

[FaveTeamz]

Summary

The existing contract upgrade runbook covers the technical steps but there is no pre-deployment checklist ensuring all safety gates are passed before a mainnet deployment. A missed step could result in an uninitialized contract or a broken admin key.

Problem

Without a formal deployment checklist, a rushed deployment could skip steps like mutation score verification, testnet smoke tests, or admin key backup — any of which could result in an unrecoverable contract state on mainnet.

Acceptance Criteria

• Create docs/runbooks/mainnet-deployment-checklist.md with the following sections:
  • Pre-deployment: mutation score >= 90%, all E2E tests passing on testnet, admin key backup confirmed
  • Deployment steps: build → optimize → verify binary size < 20KB → upload WASM → call upgrade → call initialize (or verify already initialized)
  • Post-deployment: smoke test on mainnet, verify event emission, update contract ID in backend config
  • Rollback: steps for reverting to previous WASM hash
• Add a GitHub Issue template for mainnet deployment that links to this checklist
• Review with at least 2 team members before merging

[OpensrcLord]

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Hello @maintainer, I'd love to work on this issue. I'll keep the implementation simple, clean, and well-tested.

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[macsonfleek]

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Hi Maintainer, please assign me to this issues, I can fix it shortly.

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[A-one-tech]

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[code-draft-maker]

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hello maintainer i will like to work on this issue

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