Add shapefile version and error count to upload metadata (C-15)

[Polichinel]

Context

Both dsm.upload_data() calls in _save() carry metadata but lack enrichment provenance. An enrichment timestamp was added, but the following are still missing:

• Shapefile version/hash (which GAUL/Natural Earth version produced the assignments)
• Enrichment error count (how many GIDs had geometry errors or were unmapped)
• Unmapped cell count

Without this, the FAO cannot audit the quality of received data or detect when a shapefile update changed assignments between deliveries.

Requirements

• Add shapefile version identifier to upload metadata (at minimum, a hash or modification date of the loaded shapefiles)
• Add enrichment error count if batch failures occurred
• Determine whether upload_data() API supports additional metadata fields, or if description is the only free-text field

Risk Register

C-15 (Tier 3). Partially fixed (timestamp added). Remaining: no shapefile provenance.

Note

If ADR-011 is implemented (precomputed lookup table), the provenance becomes the lookup table's version/hash instead of shapefile metadata. The requirement for provenance remains regardless of enrichment method.

[Polichinel]

Closing as superseded by #56 (2026-06-24). This issue (C-15) predates ADR-011 and asks for a shapefile version + error count in upload metadata — but the shapefile mapper was deleted (C-39, PR #42), so 'shapefile version' no longer exists. The lookup-based equivalent — structured provenance in the upload metadata (lookup_version, region, expected/actual cell count, unmapped count) — is now #56 (S5 of the FAO input-integrity epic #51). Superseded; tracking moves there.