chore: drop VPS identifier from deploy script

[satyakwok]

Five places named the operator's mainnet host alias 'vps6'. The script header, the env doc comment, and the MAINNET_HOST default are all reworded to use 'the mainnet host' generically.

MAINNET_HOST default removed — operators must now set it explicitly (error if unset). Anyone running this script already had to point at their own ssh alias; the previous default was leak surface for one specific operator's local config.

Found by a follow-up audit pass for vps[1-9] patterns across public repos.

Summary by CodeRabbit

• Chores
  • Updated deployment process documentation and added stricter environment validation to improve deployment reliability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between afed5e2 and 49370f2.

📒 Files selected for processing (1)

• scripts/deploy-mainnet.sh

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📝 Walkthrough

Walkthrough

The PR updates scripts/deploy-mainnet.sh to make MAINNET_HOST a required environment variable. The header comments now document the mainnet-host workflow where source files are pushed via scp into ~/indexer-deploy, with MAINNET_HOST required rather than defaulting to vps6. The HOST initialization is changed from a default fallback to a fail-fast pattern that aborts if the variable is unset. Related comments describing scp restrictions are also refined to specifically mention avoiding internal artifacts and local node_modules.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Sentriscloud/indexer#61: Both PRs modify scripts/deploy-mainnet.sh to clarify scp-based deployment scope and artifact handling warnings.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: drop VPS identifier from deploy script' clearly summarizes the main change—removing a specific VPS identifier from the deployment script.
Description check	✅ Passed	The description provides clear context about what changed (removing 'vps6' references, making MAINNET_HOST required) and why (security/audit finding), though it does not follow the template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/scrub-vps-id

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