feat: add method chaining support

[nedanwr]

Summary

Add method chaining across the Kronos frontend, runtime, LSP, tests, and documentation for the v0.6.0 release.

Changes

• Add postfix method-call syntax such as text.uppercase().trim().split(" ")
• Pass the receiver as the called function’s first argument
• Support chained calls on variables, literals, parenthesized expressions, and list literals
• Support indented multiline chains
• Preserve qualified calls such as math.sqrt and regex.match
• Add LSP diagnostics, completion, hover, and signature help for method calls
• Retain built-in argument-count and receiver-type validation
• Refresh the self-hosting analysis
• Bump the reported version to 0.6.0

Testing

• Add tokenizer, parser, VM, and LSP tests

• Add passing end-to-end coverage for string and collection chains

• Add failure coverage for invalid receiver types

• All existing tests pass

• New tests added (if applicable)

• Examples updated (if applicable)

• Memory leak checks pass (if applicable)

Documentation

• Mark method chaining complete in the v0.6.0 roadmap

• Document method syntax, multiline chains, arguments, and validation

• Update the website quick reference

• Refresh the bootstrap/self-hosting analysis

• Examples updated (if applicable)

• README/docs updated (if applicable)

Breaking Changes

None

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch feat/method-chaining

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