feat: Add anonymous functions (lambdas) support

[nedanwr]

Summary

Add support for anonymous function expressions (lambdas) that can be assigned to variables and called dynamically.

Changes

• Add lambda expression parsing in frontend (parser.c/h) with new AST node types
• Implement lambda compilation with new opcodes OP_CREATE_FUNCTION and OP_INVOKE_FUNCTION (compiler.c/h)
• Extend VM to handle lambda function creation and invocation (vm.c/h)
• Add owned_bytecode field for proper lambda memory management
• Extend value_new_function to support parameter names (runtime.c/h)
• Update LSP diagnostics to check lambda bodies for undefined variables
• Update LSP completion descriptions to include lambda syntax

Testing

• All existing tests pass
• New tests added (if applicable)
  • tests/integration/pass/lambda_basic.kr - basic lambda assignment and calls
  • tests/integration/pass/lambda_multiline.kr - multi-line lambdas with block bodies
• Examples updated (if applicable)
• Memory leak checks pass (if applicable)

Documentation

• Examples updated (if applicable)
• README/docs updated (if applicable)
  • website/content/docs/language/functions.mdx - lambda syntax and use cases
  • website/content/docs/quick-reference.mdx - quick reference entry
  • website/content/docs/roadmap.mdx - marked as completed

Breaking Changes

None

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Project	Deployment	Review	Updated (UTC)
kronos	Ready	Preview, Comment	Jan 28, 2026 8:10am

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