fix: add explicit error when no TypeScript logic files are found in template

[FaikAijaz]

This PR improves the robustness of TemplateArchiveProcessor by explicitly handling the case where a template declares a TypeScript runtime but contains no TypeScript logic files.

Previously, if a template had "runtime": "typescript" but no logic/logic.ts file, the engine would fail with a generic runtime error:
Cannot read properties of undefined (reading 'code')
This occurred because the processor attempted to access compiled logic that did not exist.

Changes

Added a guard in both trigger() and init() to check whether any TypeScript logic files are present.
If no logic files are found, the processor now throws a clear and intentional error:

No TypeScript logic files found in template

Added a unit test (TemplateArchiveProcessor.noLogic.test.ts) to validate and protect this behavior.
This does not affect existing templates with valid TypeScript logic. It only improves behavior when logic files are missing.