ci: bump RAINIX_SHA to b4e4607 (BNB Smart Chain in the preflight table)

[hardyjosh]

#373 pinned the revision carrying Robinhood Chain; #372 (BNB Smart
Chain) merged after it, so consumers' fork suites cannot resolve
BSC_RPC_URL until this second bump. Same 13-file bump.

Co-Authored-By: Claude Fable 5.1 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01HiqQdxokJ4edjAFyAkN9G3

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📥 Commits

Reviewing files that changed from the base of the PR and between b4e4607 and 4b419b4.

📒 Files selected for processing (13)

• .github/workflows/rainix-autopublish.yaml
• .github/workflows/rainix-copy-artifacts.yaml
• .github/workflows/rainix-manual-sol-artifacts.yaml
• .github/workflows/rainix-manual-sol-verify.yaml
• .github/workflows/rainix-rs-static.yaml
• .github/workflows/rainix-rs-test.yaml
• .github/workflows/rainix-rs-wasm-test.yaml
• .github/workflows/rainix-rs-wasm.yaml
• .github/workflows/rainix-sol-legal.yaml
• .github/workflows/rainix-sol-static.yaml
• .github/workflows/rainix-sol-test.yaml
• .github/workflows/rainix-subgraph-test.yaml
• .github/workflows/rainix-tag-release.yaml

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[hardyjosh]

• ci: bump RAINIX_SHA to b4e4607 (BNB Smart Chain in the preflight table) #374 👈 (View in Graphite)
• main

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[github-actions]

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