feat/m1-object-store-skeleton

[mahis1067]

Summary

objects.py

Contains code for following ObjectStore

• hash_object
• write_object
• read_object

Created the following CLI functions

• run_hash_object
• run_cat_file
• register_subcommands

cli.py

Wired the CLI functions from object.py into _register_commands

tests/test_objects.py

Created the following test functions

• test_round_trip
• test_identical_object_same_hash
• test_different_objects_different_hash
• test_idempotent_write
• test_unknown_hash_raises
• test_hash_object_cli_print
• test_cat_file_cli_print

Validation

• scripts/quality-check.sh
• Manual testing, if applicable:

Checklist

• The change is focused and easy to review.
• Tests were added or updated for behavior changes.
• Documentation was updated for user-facing or setup changes.
• No secrets, generated artifacts, or local-only files are included.

Notes for Reviewers

test_hash_object_cli_print should work for both the placeholder hash and SHA-1 when we implement it in Week 2.