fix: rename SOLANA_RPC_URL to RPC_URL in .env.example

[0x-SquidSol]

Summary

• Issue: .env.example documented SOLANA_RPC_URL but @percolator/shared reads RPC_URL (in validation.ts, config.ts, networkValidation.ts). SOLANA_RPC_URL is referenced nowhere in code. Operators copying the example file would set the wrong env var — silently falling back to devnet in development, or crashing in production with a confusing "RPC_URL is required" error.
• Fix: Renames the env var in .env.example to RPC_URL and adds a comment about using a paid RPC for production.

Changes

• .env.example: SOLANA_RPC_URL → RPC_URL with documentation comment

Test plan

• vitest run passes (186/186 tests)
• Verified @percolator/shared reads RPC_URL in validation.ts:39, config.ts:24, networkValidation.ts:52

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated RPC endpoint configuration variable name to RPC_URL. Added guidance on distinguishing between production and public mainnet endpoint usage.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 86372799-92d9-4857-89c2-e00da08e13b3

📥 Commits

Reviewing files that changed from the base of the PR and between fb94c29 and 878e489.

📒 Files selected for processing (1)

• .env.example

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📝 Walkthrough

Walkthrough

The .env.example file was updated to rename the Solana RPC endpoint environment variable from SOLANA_RPC_URL to RPC_URL. Accompanying comments were added to clarify that the shared library uses RPC_URL and to document guidance for production versus public mainnet endpoint configuration.

Changes

Cohort / File(s)	Summary
Environment Configuration .env.example	Renamed SOLANA_RPC_URL to RPC_URL with added documentation clarifying the variable name expected by the shared library and production vs. public mainnet endpoint usage.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A rabbit hopped through config land,
Where SOLANA_RPC_URL once did stand,
Now RPC_URL shines so bright,
With comments clear, the path is right! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: renaming a configuration variable from SOLANA_RPC_URL to RPC_URL in the .env.example file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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