[ibochielizabeth-spec]

Summary

Updates scripts/redeploy-blend-adapter.sh to support targeting Stellar mainnet via an overridable NETWORK environment variable with mainnet contract defaults (BLEND_POOL_ID and USDC_ID), and aligns the documentation in mainnet-deployment.md and environment-variables.md.

• Supports NETWORK=${NETWORK:-testnet} with validation for testnet or mainnet.
• Automatically selects mainnet default contract addresses from packages/shared/src/constants.ts when NETWORK=mainnet.
• Aligns apps/docs/operations/mainnet-deployment.md to point operators to NETWORK=mainnet bash scripts/redeploy-blend-adapter.sh.
• Documents NETWORK in apps/docs/operations/environment-variables.md.
• Code and documentation verified with pnpm prettier --check and pnpm typecheck.

closes #1144

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[collinsezedike]

@ibochielizabeth-spec the NETWORK handling and the mainnet defaults match packages/shared/src/constants.ts, and the runbook alignment is right. The commit subject is 73 characters, so the required Commit Messages check fails. Amend it to 72 characters or fewer, for example docs: allow redeploy script to target mainnet.

[collinsezedike]

@ibochielizabeth-spec closing in favour of #1219, which is the same change for #1144 on a current base. The 73-character header finding is carried into the #1219 instructions.