[AI] Expand Test Coverage - eldritch-core

[KCarretto]

Expands test coverage for the eldritch-core module within the spellshift/realm repository limit to under 5 files.

This PR adds and extends missing coverage specifically focusing on:

1. AST Offsets (analysis_extended.rs): Introduces comprehensive tests targeting find_node_at_offset checking variants across loops, conditionals, list comps, dictionary definitions, f-strings, lambda scopes, and functions.
2. Type Extraction (conversion.rs): Exhaustively tests validation implementations extracting primitives, structs, and optionals from the Value AST enumeration while also catching errors.
3. Tprint Formatter (tprint_extended.rs): Fills the gap on checking tprint macro bounds with malformed calls (e.g. empty argument lists, incorrect primitives like Int vs List of Dicts).

Modifications are confined to creating 3 distinct files within implants/lib/eldritch/eldritch-core/tests/ preserving standard styles and avoiding nondeterminism.

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PR created automatically by Jules for task 376885688499255364 started by @KCarretto

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