index_path is CWD-dependent relative path

[DeFiVC]

What

The index_path config setting is a relative path:

index_path: str = "src/knowledge/data/index.json"

This resolves against the current working directory at runtime. If the application is started from any directory other than the project root (e.g., via a systemd service, a Docker WORKDIR mismatch, or a CI script), the index file will not be found.

Why

The knowledge-base directory path in index_builder.py uses Path(__file__)\) (correct), but index_path` does not.

Scope

• Make index_path relative to the project root or use `Path(file))

Acceptance Criteria

• index_path works regardless of the working directory

Technical Context

• File: src/config.py, line 32