fix: use timezone-aware datetime in bundle export metadata and stats

[saurabhhhcodes]

Bugs Fixed:

1. Naive datetime in _extract_metadata (cgc_bundle.py:287): Used datetime.now() without timezone, creating offset-naive timestamps inconsistent with the rest of the codebase. Fixed to datetime.now(timezone.utc).

2. Naive datetime in _generate_stats (cgc_bundle.py:602): Same issue with generated_at timestamp. Fixed to datetime.now(timezone.utc) and added timezone to the module-level import.

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📥 Commits

Reviewing files that changed from the base of the PR and between 39989af and d71220d.

📒 Files selected for processing (5)

• src/codegraphcontext/cli/registry_commands.py
• src/codegraphcontext/core/cgc_bundle.py
• src/codegraphcontext/core/database_kuzu.py
• src/codegraphcontext/core/database_ladybug.py
• src/codegraphcontext/viz/server.py

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fix: use timezone-aware datetime in bundle export metadata and stats (#2)

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