refactor(fork): use vm.rpcUrl from foundry.toml, remove LibFork hardcoded URL

[thedavidmeister]

The fork RPC URL was defined in two places: foundry.toml [rpc_endpoints] (with env-var fallback) and as a string constant in test/lib/LibFork.sol. The fork test then bypassed the foundry.toml entry by calling vm.envOr("FORK_RPC_URL_BASE", FORK_RPC_URL_BASE) directly.

This removes the duplicate FORK_RPC_URL_BASE constant from LibFork.sol and changes setUp() to use vm.rpcUrl("base"), which reads from foundry.toml's [rpc_endpoints] section (which already handles the FORK_RPC_URL_BASE env var and the fallback URL). The RPC URL is now defined exactly once.

Closes #18
Closes #19
Closes #20

Co-Authored-By: Claude noreply@anthropic.com

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

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Run ID: 98d11d29-b73b-49a6-bda5-406c671ad10e

📥 Commits

Reviewing files that changed from the base of the PR and between 7415942 and 49ba80c.

📒 Files selected for processing (3)

• foundry.toml
• test/lib/LibFork.sol
• test/src/concrete/ERC4626Words.fork.t.sol

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch 2026-06-24-issue-18-19-20-fork-rpc-url

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