chore: de-submodule to soldeer (rain.interpreter -> rainlang, pyth SDK)

[thedavidmeister]

Replaces the forge-std / rain.interpreter / pyth-crosschain submodules with soldeer deps (rainlang, @pythnetwork-pyth-sdk-solidity). Versioned imports, rainlang rename + interface path drift reconciled, fromString2->fromStringV3, and the hardcoded feed-symbol IntOrAString constants recomputed for the V3 encoding (the V2 keys no longer matched the parser's V3 literal encoding). forge test 15/15 (ex. RPC-fork tests needing CI secrets).

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: cfc1e56c-ed7c-445e-9f5e-9fa296370bde

📥 Commits

Reviewing files that changed from the base of the PR and between 7db8604 and a4432e4.

⛔ Files ignored due to path filters (3)

• foundry.lock is excluded by !**/*.lock
• soldeer.lock is excluded by !**/*.lock
• src/generated/PythWords.pointers.sol is excluded by !**/generated/**

📒 Files selected for processing (29)

• .github/workflows/git-clean.yaml
• .github/workflows/manual-sol-artifacts.yaml
• .github/workflows/rainix-sol.yaml
• .github/workflows/rainix.yml
• .gitignore
• .gitmodules
• REUSE.toml
• foundry.toml
• lib/forge-std
• lib/pyth-crosschain
• lib/rain.interpreter
• remappings.txt
• script/BuildAuthoringMeta.sol
• script/BuildPointers.sol
• script/Deploy.sol
• script/build.sh
• slither.config.json
• src/abstract/PythExtern.sol
• src/abstract/PythSubParser.sol
• src/concrete/PythWords.sol
• src/lib/op/LibOpPythPrice.sol
• src/lib/parse/LibPythSubParser.sol
• src/lib/pyth/LibPyth.sol
• test/src/concrete/PythWords.pythPrice.t.sol
• test/src/lib/op/LibOpPythPrice.t.sol
• test/src/lib/pyth/LibPyth.constants.t.sol
• test/src/lib/pyth/LibPyth.getPriceFeedContract.t.sol
• test/src/lib/pyth/LibPyth.getPriceFeedId.t.sol
• test/src/lib/pyth/LibPyth.getPriceNoOlderThan.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-03-desubmodule-soldeer

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[thedavidmeister]

Reviewed a4432e4: APPROVE — de-submodule to soldeer (rainlang 0.1.2 + pyth SDK 4.3.1), CI on reusable rainix-sol + copy-artifacts, PRIVATE_KEY deploy. All 47 V3 feed-symbol constants encoding-pinned and routed through getPriceFeedId; full test suite green.