fix(cache): resolve SEED_CACHE path relative to repo root in experime…

[Adityakk9031]

Fixes #12

Summary

This PR fixes an incorrect path resolution bug in lib/experiment_cache.py where SEED_CACHE attempted to load pre-computed seed results from lib/cache/all.json rather than the repository root (cache/all.json).

Issue Fixed

• Previously, _REPO_DIR = Path(__file__).resolve().parent resolved to lib/.
• As a result, SEED_CACHE = _REPO_DIR / "cache" / "all.json" looked for lib/cache/all.json, which does not exist.
• SEED_CACHE.exists() evaluated to False on startup, causing ExperimentCache to ignore repo-committed baseline results and re-evaluate duplicate experiment diffs from scratch.

Changes Made

1. Fixed Repo Root Path Resolution:

   • Updated _REPO_DIR in lib/experiment_cache.py to Path(__file__).resolve().parent.parent.
   • SEED_CACHE now correctly points to <repo_root>/cache/all.json.

2. Cross-Platform fcntl Guard:

   • Added a safe try-except wrapper around import fcntl so _flock_with_timeout degrades gracefully on non-Unix environments (e.g., Windows).

File Changes

• lib/experiment_cache.py: Updated _REPO_DIR to resolve to the parent repository root directory.

How Was This Tested?

• Verified SEED_CACHE path in Python interactive shell:

  from lib.experiment_cache import SEED_CACHE
  print(SEED_CACHE)  # Output: <repo_root>\cache\all.json

[Adityakk9031]

@SilenNaihin have a look