fix(treesearch): prevent search.py from moving static datasets

[Oversear13]

Summary

Introduces an extension-based blacklist filter in search.py to prevent static datasets from being destructively moved to node checkpoints during tree-search iterations, significantly reducing disk-space overhead and pipeline crashes.

Problem

In the current state of AutoRecLab, the exec_node method indiscriminately collects all files within the workspace and uses shutil.move() to transfer them into the current node's checkpoint directory. This catches agent-generated artifacts (like plots or results), but datasets (e.g., u.data, .csv, .zip files) as well.

This automated moving behavior causes severe architectural issues:

Pipeline Disruption (FileNotFoundError): Once a dataset is moved to a checkpoint during the first iteration, it is missing from the workspace root in subsequent iterations, causing follow-up runs to crash.

Massive Memory Overhead: If users rely on automated loaders to bypass the missing files, the framework forces redownloads and recanonicalizations for every single node, duplicating gigabytes of data across countless hash-named checkpoint folders and triggering No space left on device errors eventually.

Dirty Git Tree: Moving local files constantly flags the datasets as "deleted" or "untracked" in the user's repository state.

Solution

We modified the file aggregation phase in search.py by introducing a robust extension-based filter (ignored_extensions).

Input vs. Output Separation: The framework now explicitly ignores typical dataset formats (.csv, .data, .tsv, .zip, .gz) when collecting files from both the workspace root and the working/ subdirectory.

Non-Destructive Execution: Static inputs safely persist in the workspace across all iterations, allowing the user to copy datasets once into the directory without them being wiped out.

Storage Optimization: Only true agent-generated artifacts (such as evaluation summaries or logs) are moved to the checkpoint folder, keeping the disk usage minimal and the Git tree clean.