fix: apply patching fixes

[DecimalTurn]

• Support table replacement with single value
• AOT path resolution fix + nested AOT fix

[Copilot]

Pull request overview

This PR improves TOML patching correctness for structurally tricky documents, specifically around (1) replacing a table section with a scalar value and (2) resolving paths under array-of-tables (AOT), including nested AOT cases.

Changes:

• Extend patch application to use a JS snapshot (updated_js) for regenerating correct AST nodes in edge cases (table→scalar replacement, AOT regeneration).
• Enhance findByPath to resolve nodes inside an AOT entry’s logical scope (covering nested AOT + sub-tables stored as Document siblings).
• Add a comprehensive spec-fixture-based regression test suite for patching.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/patch.ts	Adds special-case patching logic for AOT regeneration and table→scalar replacement using updated_js.
src/find-by-path.ts	Adds scoped AOT path resolution logic so patch operations can locate nested AOT/sub-table nodes correctly.
src/tests/patch.spec-example.test.ts	Adds regression coverage against the TOML spec example fixture for tricky patching scenarios.

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