Eco Normalize Gdelt Gkg Public Signals

Core Goal

• Read one gdelt-gkg-fetch manifest artifact plus referenced zip exports.
• Convert zipped GKG rows into canonical public signals.
• Write normalized rows into the unified signal plane.
• Return compact receipts, artifact refs, signal ids, and board-ready hints.

Triggering Conditions

• A fetch step already produced a GDELT GKG export manifest.
• The council needs row-level theme or knowledge-graph evidence instead of only manifest metadata.
• Downstream claim extraction should operate from canonical signal rows.

Read/Write Contract

• Reads one manifest artifact and its referenced zip outputs from disk.
• Writes normalized rows into normalized_signals in runs/<run_id>/analytics/signal_plane.sqlite.
• Does not generate claim candidates directly.

Required Input