feat: migrate to soldeer + use upstream CI reusable

[thedavidmeister]

Summary

Drop git submodules in favour of soldeer-managed dependencies, in preparation for publishing rain-lib-hash to soldeer.xyz so downstream consumers (rain.interpreter.interface, etc.) can pick it up via a versioned dep.

• foundry.toml: `[dependencies] forge-std = "1.16.1"`, `[soldeer] recursive_deps = false`, `libs = ["dependencies"]`
• .soldeerignore: exclude dev/CI metadata from the published zip
• .github/workflows/publish-soldeer.yaml: tag-driven publish via rainix reusable
• .github/workflows/rainix.yaml → rainix-sol.yaml: thin wrapper around upstream rainix sol reusable (drops PRIVATE_KEY_DEV fallback and stale CI_DEPLOY_RPC_URL)
• REUSE.toml: cover `soldeer.lock` and `.soldeerignore`; drop the now-gone `.gitmodules` entry
• Imports updated from `forge-std/Test.sol` to `forge-std-1.16.1/src/Test.sol`
• .gitignore: ignore `dependencies/`, `remappings.txt`, `.env`, `.pre-commit-config.yaml`

Test plan

• Solidity build OK
• 17 tests pass
• reuse lint clean

Generated with Claude Code.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2a0add45-6d69-4272-b467-68d23dba5e0a

📥 Commits

Reviewing files that changed from the base of the PR and between a4f6df6 and 8914009.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (10)

• .github/workflows/publish-soldeer.yaml
• .github/workflows/rainix-sol.yaml
• .github/workflows/rainix.yaml
• .gitignore
• .gitmodules
• .soldeerignore
• REUSE.toml
• foundry.toml
• lib/forge-std
• test/LibHashNoAlloc.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-12-soldeer

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