chore: latest rainix + soldeer re-lock

[thedavidmeister]

Bumps rainix to latest and re-locks soldeer deps.

• rainix.url -> github:rainlanguage/rainix, nix flake update rainix
• soldeer deps bumped to latest registry versions where behind, then re-locked
• verified via nix develop (latest rainix dev shell)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 99461ec7-787e-4e17-9cff-784268f63a83

📥 Commits

Reviewing files that changed from the base of the PR and between af2b94c and 95ca664.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• flake.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-01-latest-rainix

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[thedavidmeister]

Reviewed 95ca664: flake-only change — bump pinned rainix to latest main f22d4dc (+ flake.nix url/deadnix cleanup where present). No src/test changes. CI green. Approve.