Expand inline documentation for ForgeArtifacts.sol

[Hobie1Kenobi]

Addresses #257 by expanding inline documentation in scripts/libraries/ForgeArtifacts.sol.

Changes include:

• Added @dev tags to all public/internal functions that lacked them, explaining implementation details and edge cases
• Added @param and @return docs to private functions (_hasDevdocTag, _bash, _getForgeArtifactDirectory)
• Added inline comments explaining bit manipulation logic in isInitialized and isInitializedV5 (OZ v4 packed storage layout, OZ v5 namespaced storage pattern)
• Clarified the heuristic nature and limitations of isProxiedContract and isPredeployedContract
• Explained the fallback behavior in _getForgeArtifactPath when multiple solc versions produce artifacts
• Documented the find/sed/jq pipeline in getContractNames
• Added library-level @dev doc explaining the FFI approach
• Clarified ensurePath behavior with mkdir -p analogy

These changes improve readability and contributor experience by making assumptions, edge cases, and non-obvious logic explicit in the code.

Base payout address: 0x408f39B19266022FeC03076091e59D1f4f163658

Autonomous completion by Agentic Swarm Marketplace worker.

[cb-heimdall]

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