Rename CodebaseGraph to CodebaseContext

[EdwardJXLi]

CodebaseGraph is misleading and has been a deprecated term since the Codebase Initialization Refactor.

[codecov]

Codecov Report

Attention: Patch coverage is 91.05126% with 103 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/codegen/sdk/core/codebase.py	63.79%	21 Missing ⚠️
src/codegen/sdk/core/assignment.py	30.00%	7 Missing ⚠️
src/codegen/sdk/core/autocommit/decorators.py	0.00%	5 Missing ⚠️
src/codegen/sdk/core/autocommit/manager.py	37.50%	5 Missing ⚠️
src/codegen/sdk/typescript/ts_config.py	50.00%	5 Missing ⚠️
src/codegen/sdk/codebase/validation.py	42.85%	4 Missing ⚠️
src/codegen/sdk/python/assignment.py	33.33%	4 Missing ⚠️
...egen/sdk/python/statements/assignment_statement.py	55.55%	4 Missing ⚠️
src/codegen/sdk/typescript/assignment.py	33.33%	4 Missing ⚠️
...t/codegen/sdk/python/autocommit/test_autocommit.py	0.00%	4 Missing ⚠️
... and 23 more

Additional details and impacted files

[github-actions]

🎉 This PR is included in version 0.7.0 🎉

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