fix #1699: алиас ThisObject для ЭтотОбъект

[Mr-Rm]

Возможность добавлять алиасы для локальных переменных модуля

Summary by CodeRabbit

• Refactor
  • Improved field alias handling to ensure module fields properly track and manage alias values.
  • Enhanced consistency in compile-time symbol generation for object properties.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 123dfe63-0002-4069-9abb-b807a5dd978d

📥 Commits

Reviewing files that changed from the base of the PR and between 01167fe and 985230b.

📒 Files selected for processing (3)

• src/OneScript.Core/Contexts/BslFieldInfo.cs
• src/OneScript.Core/Contexts/BslScriptFieldInfo.cs
• src/ScriptEngine/Machine/Contexts/ThisAwareScriptedObjectBase.cs

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📝 Walkthrough

Walkthrough

This PR makes the Alias property abstract in BslFieldInfo, forcing subclasses to provide their own implementation. BslScriptFieldInfo adds backing storage via an internal _alias field that persists alias values through the SetAlias method. A separate change ensures the ThisObject symbol uses a constant index rather than a magic number for consistency.

Changes

Field metadata and context property handling

Layer / File(s)	Summary
Abstract Alias contract src/OneScript.Core/Contexts/BslFieldInfo.cs	Alias property becomes abstract, requiring derived classes to implement alias value provision instead of defaulting to null.
Alias field storage and implementation src/OneScript.Core/Contexts/BslScriptFieldInfo.cs	Constructor initializes _alias field, Alias override returns stored _alias value, and SetAlias assigns incoming alias to the backing field.
Symbol index constant alignment src/ScriptEngine/Machine/Contexts/ThisAwareScriptedObjectBase.cs	ThisObject symbol dispatching index uses THISOBJ_VARIABLE_INDEX constant instead of hardcoded 0.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A field needs a name, now written in stone—
abstract decrees what must be shown.
Constants replace the magic numbers,
each alias stored, no longer slumbers.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly addresses the main change: making the Alias property abstract in BslFieldInfo and implementing alias support in BslScriptFieldInfo, which enables adding aliases for module local variables like the ThisObject/ЭтотОбъект aliasing described in the objectives.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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