deploy: always sign with PRIVATE_KEY (never PRIVATE_KEY_DEV)

[thedavidmeister]

Per project policy, deploy workflows must always sign with secrets.PRIVATE_KEY. Replaces the github.ref == 'refs/heads/main' && secrets.PRIVATE_KEY || secrets.PRIVATE_KEY_DEV conditional in: manual-sol-artifacts.yaml rainix.yaml

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 780153d3-272a-4f9c-81f9-5a575ede50e1

📥 Commits

Reviewing files that changed from the base of the PR and between 952acc9 and 6f24899.

📒 Files selected for processing (2)

• .github/workflows/manual-sol-artifacts.yaml
• .github/workflows/rainix.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-03-private-key

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[thedavidmeister]

Superseded by #473 — a fresh one-line PRIVATE_KEY fix off current main. This branch was based on a pre-FlowTest-refactor main and no longer compiled (stale generateFlowStack).