bug: Antigravity entries not capturing model name

[codeprakhar25]

Bug

When Antigravity makes code changes, the ledger entry records the agent as the git user (human) rather than antigravity, and the model field is empty.

Expected:

{"agent": "antigravity", "model": "claude-3-7-sonnet", ...}

Actual:

{"agent": "Prakhar Khatri", "model": null, ...}

Root cause (suspected):
The capture-antigravity.py hook may not be firing, or the payload from Antigravity's hook does not include the model name in a parseable field.

Debugging steps:

1. Check ~/.agentdiff/logs/antigravity-hook-fired.log after an Antigravity edit — if empty, the hook is not firing at all
2. If the log has entries, inspect the payload for the model field name

Environment:

• agentdiff v0.1.16
• Antigravity (version unknown)

Contributions welcome — especially from anyone who has Antigravity's hook payload schema.