Add unit tests for services/session_parsers/claude_code.py

[adya07pandey]

Background

services/session_parsers/claude_code.py parses Claude Code JSONL session transcripts into normalized frontend events, but currently has no dedicated parser test coverage.

What needs to be done

Create tests/test_claude_code_session_parser.py.

Cover:

User prompt parsing
Assistant response parsing
Thinking blocks
Tool use events
Tool result merging
System events
Attachment events
Invalid JSON handling
Meta event skipping

Acceptance Criteria

Major event types are covered by tests
Edge cases are covered
pytest tests/test_claude_code_session_parser.py -v passes
Existing test suite continues to pass

[adya07pandey]

/take

[github-actions]

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