soldeer migration

[thedavidmeister]

Migrate from git submodules to soldeer, mirroring rainlanguage/rain.solmem (rain.solmem v0.1.2 published end-to-end). Closes#10.

Changes

• foundry.toml: libs=["dependencies"], [dependencies] forge-std="1.16.1", [soldeer] recursive_deps=false
• forge-std submodule and .gitmodules removed
• Test imports updated to forge-std-1.16.1/src/Test.sol
• .soldeerignore with depth-anchored patterns (gitignore-style globs match any depth, so unrooted lib/test would have hidden src/lib/* from the publish zip)
• REUSE.toml extended for .soldeerignore, remappings.txt, soldeer.lock
• CI: drop submodules:recursive, drop rainix-sol-prelude (deprecated), add forge soldeer install before each task
• Publish workflow: thin wrapper calling rainix's reusable workflow
• flake bumped to current rainix; default devShell now points at sol-shell
• README rewritten for the package, install/dev flow, and publish process

Test plan

• forge build clean
• forge t est passes (6/6) — locally
• CI pipeline green on this PR

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: c1ac0816-7bd9-42d0-8876-2739a9cf51ee

📥 Commits

Reviewing files that changed from the base of the PR and between 122a490 and 73a6669.

⛔ Files ignored due to path filters (2)

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

📒 Files selected for processing (12)

• .github/workflows/publish-soldeer.yaml
• .github/workflows/rainix.yaml
• .gitignore
• .gitmodules
• .soldeerignore
• README.md
• REUSE.toml
• flake.nix
• foundry.toml
• lib/forge-std
• remappings.txt
• test/src/lib/LibCtPop.ctpop.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-09-soldeer

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